jbrill

Hey guys,
I'm trying to find TDC on my s2 and am having some issues since there is no "OT" on the flywheel from the viewing window on the top, back part of the motor.
I don't know why there is no "OT".

Anyways, I used a dial gauge to dial in the #1 piston to the very top, on what I think is the compression stroke (all valves closed on #1 cylinder). Then i checked the markings on the timing belt cam roller and it lines up perfectly. is it safe to assume I'm at TDC? Can I begin ripping into the motor and remove and replace my cams?

joonas

Do not make *** of u and me. Do you have factory manuals? There is description how to dial in right timing.
If you remove the cams you do not need to align them first.

jbrill

hmmmmmmmmm.... so if im taking the cams out it doesnt matter if im at tdc??

MM951

When you take the cams out all the valves will close. I'd still verify TDC before taking anything apart

jbrill

Then how should i verify TDC when there are no marks on my flywheel?

jbrill

anyone else have any comments/ideas?

jstand22

Yes, that is TDC

jstand22

If you are taking the cams out you DO NOT have to be at TDC....However placing the cams back in at TDC with the block at TDC is crucial. There are marks on the camshafts themselves, that need to be facing upwards to indicate TDC, take pictures of how they are oriented now.

When you place the cams back in you have to set both the cams and crank at TDC. BEFORE you put the cams in rotate the engine to TDC, then orient the cams to TDC and then you can bolt them in.

How are you going to set the cams to TDC when you put them back in, dial gauges? or by the marks?

joonas

http://www.clarks-garage.com/shop-manual/eng-13.htm

Are you sure you changed fywheel not the pressure plate? And if you did change the fywheel you should have marked the timing lines on new fywheel.

joonas

Vol1A-Engine.pdf tells you all that you need about cam timing.

If you cannot fix camshafts in place loosen the bolts eavenly othervise they can get stuck when one end is pushed up by valve springs.

jbrill

I have now read through the factory manual and according to the photo that is in it (the way the cams lobes on cylinder 1 are facing), i am at TDC. But I will check with the dial gauges one more time...

How important is being at TDC since i will be removing both cams, timing belt etc... will I not have to re-time it all anyways?

joonas

Cam gear on the picture is at TCD. If you are sure that crank is at TDC also then you could install flywheel lock and preserve crank TDC that way.

So when you install new camshafts you can put the camshaft marks at TDC and get the belt on the right way.

Remeber, crankshaft one turn = camshaft two turns.

jbrill

as far as i can tell (without using flywheel markings)
- #1 piston is at the very top (according to dial gauge)
- Mark on timing belt cam roller lines up perfectly
- both exhaust and intake cams on the #1 cylinder are not pushing down on any valves and are about a 45 degree angle inwards, point up. (as seen in the photo above)

Thats TDC correct?

joonas

It seems to be if you have not loosened the cam gear central bolt. You should put 3 bolts to keep the cam to cam gear alignment. This cam gear mark is filed in after the timing is set in the factory. Timing is set and then the crank is turned to TDC and then mark is filed in to the cam gear. This mark is valid until the camshaft to camgear timing is changed (3 bolts and central bolt loosened together.

http://www.clarks-garage.com/shop-ma...ure-index3.htm
Look camshaft section.

joonas

Look 1A pdf page 67. It explains how the TDC mark is put on cam gear.