Project: Rebuild!

Engines, Transmissions & Final Drive questions and answers

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sabretooth
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Postby sabretooth » Wed Apr 18, 2007 12:00 am

With some time to burn and a parts bin to try and empty out, I dug around for the appropriate bolts, and decided that the rear main seal was to go on next.

Despite being close to the engine stand's mount, the crankshaft's rear face was still accessible with the right tools:

Image

So, looking at the back of the rear main seal's retainer, you can see channeling where RTV silicon is meant to go. So with the tube - on it went:
Image Image
As an aside, the shorter of the bolts there were not used, but bolts the next length up were. I'd gotten the sizes one step off...

From there it was just a matter of fixing the seal to the block, and to the correct torque:
Image Image

And it's done.

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sabretooth
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Postby sabretooth » Wed Apr 18, 2007 12:07 am

I'd now reached a point where there was no real reason not to put on the timing belt. The remaining work can all be done with everything in place, so it was finally time to make it look more like a working car engine.

First up, on went the timing belt pulleys - the idler pulley went on the right, and then the tensioner pulley on the left. The tensioner pulley pivots on a notch on the pump, and has a pulling force applied to it by a spring that's latched to another part of the pump. This spring is what puts the tension on the belt. So, when putting the tensioner pulley on, I pulled the tensioner right out of the way and then only nipped the tensioner bolt up a little bit - just enough to lock the pulley in place so that it placed no pressure on the timing belt.

The crankshaft requires about 116ft.lb of torque, so I needed some way to stop the crank rotating. What we did was brace the crank at the rear by using 2 old flywheel bolts and a long, tough screwdriver (the widowmaker makes a reappearance!). The screwdriver was placed so that the bolts 'locked' onto the screwdriver:

Image

So, I slipped the timing belt around the crank cog, put the crank timing plate on and then followed with the crankshaft bolt. The screwdriver prevented crankshaft rotation while I torqued up the crank bolt:
Image

And now to finally set the timing. First, we align the crankshaft to the timing mark on the oil pump:
Image

And then line up the camshafts. Here you see my previously mentioned patented (cough) technique for camshaft locking - grab two shifters and turn the crank so that a) the E and I on each camshaft lines up with each E and I on the black timing plate, and b) the shifters overlap when condition A is met. If you're soloing this, then you need a clamp that you can operate single-handedly, as it's expected you'll be holding the shifters with one hand, and the clamp with the other. Once it's clamped, you should end up with something similar to:

Image Image
Last edited by sabretooth on Wed Apr 18, 2007 12:10 am, edited 1 time in total.

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sabretooth
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Postby sabretooth » Wed Apr 18, 2007 12:10 am

You should be able to count 19 teeth between the small notches at the topmost part of each camshaft sprocket. If not, you'll have to adjust as necessary until there is. Now, once set - remove the clamp and shifters, and everything should stay in place! Rotating the crank now should result in clean rotation of the camshafts, crank and pulleys. Here you'll note that particular parts of the belt are slack, and some may be tight. What we need to do here is rotate the whole assembly and move all of the slackness over to the side of the belt where the tensioner pulley is. So give the crank at least 2 full rotations so that you can get a feel for when the belt is definitely slackest on the camshaft pulley side. Once rotated there, back the tensioner pulley's bolt off a little bit, and the tensioner should spring into place and place tension on the belt. Do up this pulley and the other pulley to their correct torque, and we have now successfully set the timing.

Image

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jules
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Postby jules » Wed Apr 18, 2007 2:09 pm

Getting all ready for Dodgy Day install there Sabre! :D

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sabretooth
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Postby sabretooth » Thu Apr 19, 2007 12:39 am

Hell yes! Things are largely on track now :)

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Postby neil d » Fri Apr 20, 2007 9:55 am

Hi Saber

The donk is looking good 8)

What pistons are you using?

Neil
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sabretooth
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Postby sabretooth » Sun Apr 22, 2007 2:39 am

Hi Neil, cheers! The pistons are Wiseco forgies.

So, more engine stuffs. I still need to purchase a second thermostat gasket (due to using a coolant reroute spacer), some running-in oil (any recommendations/experience?) and some other bits and bobs. I went to a bolt place in Woolloongabba to replace the exhaust studs, but unfortunately they couldn't help me - the studs they had there were to suit Holdens, and one side wasn't long enough. I'll have to look elsewhere, and if all else fails I'll just run the die over the threads to clean them up a bit.. just in case.

No real excitement today, but progress is progress. I went again to MX-5 Plus - unfortunately my coolant reroute pipe wasn't completed, but I should be able to get it by Wednesday. What I did come back with though, was a matching alternator. Fixing my existing one would involve the purchase of a large enough die - which I estimate are about $30. The thread was butchered when a mate removed the pulley from the alternator when trying to fit another one to it. So, $50 later and I just got a whole replacement alternator! A bit of cleaning with some autosol, a steel brush and some degreaser got a lot of the surface rust off of it - it's looking a fair bit more respectable now.

Fitting the alternator - well, it doesn't get much easier:

Image Image

The only thing worthwhile noting there is that the alternator pivot bolt goes in from the rear for ease of future removal - else if you want to remove it with the engine still in the car you'll just find it a rather difficult task.

The alternator came with the appropriate tensioning bolt and bracket - which I've been unable to resist blinging. The bracket, water pump pulley and crankshaft pulley have all been hit with a coat of brake caliper paint and will hopefully turn out shmick! Right now the parts are sitting in my engine bay - absorbing a bit of heat to help the paint cure.

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Boags
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Postby Boags » Sun Apr 22, 2007 10:10 am

Super nice effort Sab... 8)

One question, why were you up curing paint at 2.39am??? :?

Boags :mrgreen:
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sabretooth
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Postby sabretooth » Sun Apr 22, 2007 1:30 pm

I posted at 1:39! Fix your timezone, Boagsy! :)

I did the painting earlier, and figured, \"Well, warm engine, and parts only painted a few hours ago...\" - popped the bonnet and plonked the parts on top!

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Mr Starlet
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Postby Mr Starlet » Thu Jul 03, 2008 1:25 pm

Sorry for digging up an old thread but I'm heading down similar roads and this thread is gold. Super effort Sab!!!

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corners
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Postby corners » Fri Feb 27, 2009 11:52 am

I just read this front to back!!!

What a great and detailed thread!!!!

Much appreciated and well worth the read!!


Any further updates???
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daffyflyer
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Postby daffyflyer » Fri Feb 27, 2009 10:41 pm

This looks like a thread i need to pay some attention to!
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RG.net
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Postby RG.net » Sat Feb 28, 2009 1:04 pm

the thread is over 2 years old guys!

i'm not sure if he even posts anymore.
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Okibi
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Postby Okibi » Sat Feb 28, 2009 2:04 pm

Still as awesome as the day it was written :mrgreen:
If you had access to a car like this, would you take it back right away? Neither would I.

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sabretooth
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Postby sabretooth » Tue Mar 03, 2009 6:25 pm

I'm still alive! A few things have happened on the car front, but generally I've been either too lazy or busy to post in the thread.

I'm currently suspecting a blown headgasket thanks to some dodgy-looking coolant, but hopefully it doesn't come to that.

Random stuff done to the car so far really just consists of an NB roof, which has installed many months ago. Glad I've got it - would never go back to dodgy plastic roof. I'll have to start posting again, then!


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