Mazda Rotary Club

General => General Technical => Topic started by: ianelvar on July 01, 2008, 10:00:10 AM

Title: My rebuild thread
Post by: ianelvar on July 01, 2008, 10:00:10 AM
Hello all! After all the work I put into getting my FD into shape to sell, she\'s turned round and bitten me. First of all the paint started peeling off like badly applied wall paper (that\'s no exaggeration either!) because some clown has clearly done a massive botch job on it, but now she\'s gone and blown a coolant seal.

The paint is being fixed by a local spray shop that\'s happy for me to prep the car myself. So far I\'ve peeled off a lot of the cruddy paint back to the primer that\'s been applied over the top of the original paint, then I\'m going to flat it all back, filling any little imperfections as I go. Unfortunately I forgot to renew my membership at the start of the year so I can\'t post pics just yet, but I\'ve signed up for six months and hopefully I\'ll be a full member again in the near future.

The big thing is the engine though. When I first bought the car it had an engine with zero compression, so I sourced a running engine from a crashed car. Supposedly this engine had only done 10K since begin rebuilt, but the guy had no documentation. More fool me, I hear you say, but I was young and naive, and didn\'t know what I know now. However, the new motor had good compression and pressure tested OK, so no sign of seal failure. As it happens the original motor is a total write off, with cracked plates, severely worn housings, and side seals welded into rotors.
After many trials and tribulations caused by a bent crank sensor plate I got her running really nicely, and she\'s been perfectly reliable for the last year. Last Saturday while I was up in Didcot working on a steam engine Laura took her out for a drive, and the whole cooling system erupted in a massive ball of steam. A couple of mates of mine were kind enough to tow her home, and having had a good look I\'m 100% sure she\'s suffering from seal failure. The symptoms are as follows:

Losing coolant. No external leaks.
Loads of white smoke on start. Starts fine and runs perfectly though.
Pipes do not pressurise before they should
No "Champagne"

I have a suspicion the seals have gone in the exhaust section, rather than the combustion area. While the CAS wasn\'t working right the timing was so out the turbos were running up at idle, and the exhaust was INSANELY hot. I think this may have contributed. It\'s only a theory - we\'ll find out when I pull the motor apart.

Over the next couple of weeks I\'ll be photographing and documenting every stage of pulling the engine out, taking that ancillaries off, stripping it, then putting it all back together again.

I\'ve cleared my garage and set up a bench just for tearing the motor down. I\'ve actually got 2 engines to do, as my silver FD also has seal failure. It was like that when I bought it though.

I\'ll be making some tools along the way too - A locking tool for the flywheel and a rotary adaptor for my engine stand.

Wish me luck! I hope you enjoy the thread :cheers
Title: My rebuild thread
Post by: shaunwil on July 01, 2008, 12:55:15 PM
Good luck :D

Take plenty of photos.

Shaun
Title: My rebuild thread
Post by: SmbFD3S on July 01, 2008, 02:18:23 PM
Look forward to seeing it progress mate, as i will be doing this soon myself :) so will be good to see how to get the engine out and ancillaries and all that.  The engine itself i\'m not worried about as have already done this on a test bench, but have yet to actually take one out of a car :)
Title: My rebuild thread
Post by: ianelvar on July 01, 2008, 03:34:45 PM
Thanks for the support guys. I\'m actually going to be doing it a little bit backwards, and doing the rebuild first. I\'ve already pulled the engine from the silver one, so I\'m going to attack that and then pull the engine out the red one when I\'ve got an engine ready to go in. It only took me an afternoon working slowly to take the engine out last time - I couldn\'t believe it!
I\'ve been working on a mates BMW E30 over the past few months doing a megasquirt install, and helped him take the gearbox out when he had clutch trouble. I have to admit, the jap way of doing things wins hands down every time, and I appreciate the Nippon engineering goodness even more now!
Title: My rebuild thread
Post by: Matt_K on July 01, 2008, 03:43:17 PM
I\'m doing this at the moment, documenting and almost blogging my rebuild on another forum. I\'ve just put the rotors and housings together this weekend gone.

Good luck with it! it\'s great fun! :D
Title: My rebuild thread
Post by: ianelvar on July 01, 2008, 05:47:54 PM
Cheers :cheers Could you post a link to your thread?
Title: My rebuild thread
Post by: ianelvar on July 01, 2008, 11:36:54 PM
I made some good progress today, and got the turbos, OMP, air pump, alternator, water pump, A/C and PS support bracket, E-shaft lock nut and flywheel off. I\'ve got pics for every single bit I\'ve removed, and hopefully I\'ve caught all the \'action shots\' of how to set the tools up for the trickier jobs, but the write up will have to wait till tomorrow - I need some sleep :Snoring

\'night all :guinness
Title: Disclaimer:
Post by: ianelvar on July 02, 2008, 06:37:53 PM
Just the usual stuff I\'m afraid. This thread is intended as a supplement to the proceedures in the Factory Service Manual, based on my personal experience of carrying out the proceedures. As such, I will not accept any liability for loss, damage or injury caused by using information contained in this thread.
I will be making my best endeaviours to make it safe and error free, but I\'m only human, and i don\'t write technical documents for a living. If I\'ve missed something out, got something horrendously wrong, or you\'d like something clarifying I\'ll be more than happy to oblige or correct as appropriate. Please keep discussion on topic if you\'ve got something to add, as this will end up being a long one anyway.
I hope it doesn\'t cause a problem that I\'m about to upload a bunch of pictures - Mods, please tell me if there is an issue and I\'ll try and sort out some external hosting. Photos have all been resized to 1024x768 to keep the size down, but I\'ve got all the originals available from the 5mpx camera if anyone wants to see something more clearly.

The car being worked on is a \'93, UK spec FD with no modification. The engine I\'m initially working on is a \'92 Jap spec engine, so I\'ll try and point out the differences as I go along.

So, without further ado, on to my first actual post.
Title: Engine as removed from vehicle following FSM instructions
Post by: ianelvar on July 02, 2008, 06:49:30 PM
The inlet manifold, turbos etc do not need removing from the engine to pull it out of the vehicle. I\'ll be covering this more fully when I actually take the engine out of the car I\'m currently working on. Until then, this is what I\'ve got to work with:
Title: Remove engine mounts
Post by: ianelvar on July 02, 2008, 06:55:54 PM
Undo the six large bolts holding the mounts to the engine (3 each mount, left hand shown from underneath):

This gets the out of the way for when the motor is put on the bench. At this stage it\'s easiest to have the engine held in the air a little way on the engine crane.
Title: Remove the alternator and PS bracket
Post by: ianelvar on July 02, 2008, 07:09:00 PM
Slacken off the alternator bolts as shown and remove them and slide the belt off now the tension is removed.

Remove the 2 bolts and 4 nuts that hold the A/C+PS bracket on to the side of the engine, and remove it along with the loom support bracket.

Undo the bolt that holds the alternator tension bracket to the front of the water pump, and remove it You will already have removed the nut that holds it to the A/C bracket when you removed that. The alternator can now easily be swung upwards and removed.
Title: Remove the air pump
Post by: ianelvar on July 02, 2008, 07:18:24 PM
Move the hose clip down the outlet pipe so it no longer sits around the metal part, and free the pipe by gripping it gently from the side with pliers and twisting it around the metal pipe. This frees the rubber from being stuck to the pipe allowing easy removal.

Remove the two bolts supporting the air pump, and release the electrical conenctor. The air pump can now be removed from the engine.
Title: Y-pipe removal
Post by: ianelvar on July 02, 2008, 07:27:18 PM
Remove the rear turbo inlet pipe by taking off the two nuts that hold it to the turbo, and removing the bolt securing it half way along its length.

To remove the Y-pipe, start by taking off the small rubber pipes that attach to it at the points shown, then removing the 4 nuts that connect it to the two turbo outlet pipes.
Title: My rebuild thread
Post by: ianelvar on July 02, 2008, 07:28:16 PM
Next is the turbo pack, but that will have to wait for later - I have a rats nest to remove!
Title: My rebuild thread
Post by: ianelvar on July 02, 2008, 11:19:05 PM
Down to the bare block now, with sump and oil pump off. I\'ve had to stop because I need to build something to support the engine while I undo the bolts and take the layers off. More of the write up to come tomorrow.
Title: Remove top heat shield
Post by: ianelvar on July 04, 2008, 05:49:51 PM
Remove the three bolts holding the heat shield on. Try not to break them like I did. Thry will often start to move, then jam up again like mine did. Free them off a touch, then stop if they stick, and cover in plenty of penetrating oil - WD40 will do -  and work back and forth until they come loose. It might seem like a lot of work, but it\'s much less than drilling them out when they\'ve sheared off.
Title: Remove the turbo pack
Post by: ianelvar on July 04, 2008, 06:01:05 PM
Using two spanners, release the oil feed. 1 spanner is required to stop the pipe spinning while you back the nut off with the other spanner.
Undo the bolts securing the oil drain-back pipes fore and aft of the turbo pack.
Loosen the rubber pipe that connects the turbo pack to the coolant top hose casting.
Remove the two nuts that secure the inlet elbow to the front turbo, and move tabs that secure the metal vacuum and pressure pipes out of the way.
Disconnect the two rubber hoses that connect to the two actuators at the front of the turbo pack.
Remove the eight nuts and bolts that secure the turbo pack, and pull it clear, making sure all the hoses and connections are free.
Title: Remove the exhaust manifold heat shield and actuator
Post by: ianelvar on July 04, 2008, 06:07:32 PM
Remove the two bolts securing the heat shield to either side of the manifold, and the nut underneath holding the plate protecting the acutator.
Diconnect the actuator from the lever by pulling the spring clip free with long nose pliers, then remove the two larger bolts holding the actuator to the bottom of the manifold.
Lift the actuator and sheild free of the manifold.
Title: Remove the exhaust manifold
Post by: ianelvar on July 04, 2008, 06:10:57 PM
Remove the 4 nuts securing the manifold to the block, and pull it free. The studs may come with the nuts, but this often can\'t be helped.
Title: Remove the Oil Metering Pump - OMP
Post by: ianelvar on July 04, 2008, 06:15:53 PM
Disconnect the 2 small oil banjos.
Remove the 3 bolts securing the OMP to the front cover.
Do not try to disconnect the electical conenction from the OMP - the loom with be split further up at a later stage. For the moment, support it out of the way for the removal of the water pump.
Title: Remove the water pump
Post by: ianelvar on July 04, 2008, 06:22:45 PM
Diconnect the gauge temp. sender which is on the front of the assembly.
Disconnect the small hose at the back.
Undo the nuts securing the water pump to the front of the engine.
Pull the water pump forwards a couple of inches, then disconnect the coolant level sensor and ECU temp sensor on the back.
Move the OMP oil lines and loom out of the way, and pull the assembly clear.
Title: Remove oil filter mount and cooler line
Post by: ianelvar on July 04, 2008, 06:25:15 PM
Remove the 2 nuts securing the plate to the back of the block, and the nut supporting the oil line at the front.
Title: Remove the front pulley and CAS plate
Post by: ianelvar on July 04, 2008, 06:28:13 PM
Undo the 4 bolts securing the pulley wheels to the nose of the eccentric shaft, and pull them clear. The bolts are best undone with the ratchet set as shown, as this tends not to rotate the shaft whilst the nuts are turned.
Title: Remove the clutch
Post by: ianelvar on July 04, 2008, 06:31:26 PM
Progressivley undo the 6 bolts holding the clutch pressure plate to the flywheel in several passes. Pull the pressure plate free of the small location dowels and remove the friction plate.
Title: Remove eccentric shaft nose bolt, and flywheel nut
Post by: ianelvar on July 04, 2008, 06:36:45 PM
Mount a tool to prevent rotation of the flywheel as shown.
Heat the E-shaft nose bolt for a couple of minutes to loosen the thread lock.
Use an impact wrench to loosen the bolt. Do not remove it fully at this stage.
Use an impact wrench to loosen the flywheel nut.
Title: My rebuild thread
Post by: ianelvar on July 04, 2008, 06:41:23 PM
That\'s all on the write up for today. I\'ve stripped the block down and found that most of it is scrap. Housings have chrome scraped off where the small part of the seal runs past the exhaust port (I can\'t help thinking the apex seals aren\'t a great design), all the plates have deepish score marks enough to catch a nail on, and the front and back have broken walls to the coolant seal channels. All in all, it\'s not looking very good for this motor.
Title: My rebuild thread
Post by: matt p on July 06, 2008, 01:36:39 PM
Cracking write up so far ian!...shame about the engine though, are you replacing the housings or just binning the whole thing?

Regards

Matt
Title: My rebuild thread
Post by: ianelvar on July 06, 2008, 01:46:31 PM
Thanks :) I\'m about to strip the engine that was in the car until yesterday to see what that looks like, and then try to make 1 good one out out of what\'s useable in both of them. Fingers crossed I\'ll get some good housings! I have made a few enquiries with chroming companies about the possibility of getting the worn housings re-chromed. There are a fair few that are tooled up for applying chrome to aluminium, and as they\'re scrap anyway I might as well give it a go!
I\'ll have a chat with Carl about the possibility of getting the plates lapped in the week as well. I think the rotors will be ok, they seem to have cleaned up reasonably.
Title: Remove the flywheel
Post by: ianelvar on July 06, 2008, 02:01:44 PM
Attach a flywheel puller as show locating two appropriate bolts into the threaded holes in the flywheel. Have the flywheel nut on the e-shaft so the back edge is flush with the end of the shaft. There should be about 4mm clearance between the nuts and the flywheel at this point.
Use a thick piece of metal over the top of the nut as a load spreader, and tighted up the bolt on the puller. Occasionally the flywheel will come off just with some pressure from the puller, but most of the time it will need some assistance.
If the flywheel won\'t budge, keep pressure on the puller, and strike the flywhee around the edge as shown. DO NOT STRIKE IT ON THE SHINY BIT THAT THE FRICTION PLATE RUNS AGAINST, OR YOU WILL DAMAGE YOUR FLYWHEEL!
You should find the after a couple of knocks with the hammer it will come off with a bang! It can\'t go very far as the nut is still there to stop it, but it will still be quite impressive.
Remove the puller, take the nut off and withraw the flywheel.
Title: Remove the e-shaft nose bush
Post by: ianelvar on July 06, 2008, 02:07:46 PM
Wind the lock nut right out, then back in three turns.
Apply three leg pullers as shown.
Tighten up the pullers and the bush will start to move. You shouldn\'t encouter too much resistance, and it will come away quite easily. It will eventually pull up against the back of the nut. At this point, take the pullers off, undo the nut, being careful to with draw the springs inside, and slide the bush off by hand the rest of the way. Put the nut and internals back into the e-shaft to protect it and keep them safe.
Title: Disaster!
Post by: ianelvar on July 06, 2008, 02:16:03 PM
I forgot to take any pics of the engine removal proceedure!!!! Sorry guys.
Started at 18:00 yesterday, and got on a bit of a mission. By 10:00 I had it ready to come out, but thought I\'d leave it till this morning as it was getting late. I had a minor altercation when I forgot about the pull clutch, and spent a few minutes wondering why I couldn\'t pull the engine clear. I had to bolt it back up to release the collar then it came out like a dream! It\'s now awaiting being stripped apart this afternoon.
Title: My rebuild thread
Post by: greg_whit_se7en on July 18, 2008, 12:14:05 AM
Great tear down posts, good luck with the rest of the rebuild.

Greg