jeeper31

Trying to find TDC on my first t-belt job. There doesn't seem to be any marking on the flywheel but there does seem to be a hex screw that I see pass the window. Does this have anything to do with TDC?

Darwantae951

When we did a tbelt job on my friends 86, we couldn't even see into the hole. Instead we used the cam gear and lined up a mark underneath by the starter. You can out how here:

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

-Darwin

jeeper31

Believe it or not I can't find the hole by the starter

theedge

If you cant see that hole in the bell housing, your wife/girlfriend must be pretty unsatisfied in bed.... Ba dum tish

Spidey944

put some hair around it. Maybe that'l help!

adrian1

When you use a drop light you can see it through the hole in the top, if you want help and don'y live far from nyc and i can come down.

BlacknRedGT

Just look through the hole on the distributor cap and turn the engine until you see the marking on the camshaft sprocket. I just started my first t-belt job too and I have a findanza flywheel so there are no markings for me to go by on that. Seems like Im a few steps ahead of you so just let me know if you have any questions.

Spidey944

What you seek is realy a small window at the bottom of the belhousing with a notch cut out of it. You are probably overlooking it because it seems too simple.

F18Rep

xsboost90

there is a mark in the top of the flywheel that lines up w/ the line inside the top of the bellhousing- however ive found its simpler to line up the marks on the bottom of the bellhousing w/ the line on the bottom of the flywheel. Either is adequate.

Darwantae951

Just using the cam sprocket alone is not a good idea. The cam turns half as fast as the crankshaft so you may be 180 deg out of TDC (or also called BDC).

-Darwin

jerome951

If you can't find any markings, pull #1 plug and put a stick in it (I use 1/2 of a chop stick). When it reaches it's highest point while rotating the engine, you've found TDC.

However, the stick will be at the top of the stroke for a bit so it gets you within a few degrees. Use this to verify TDC on the cam sprocket.

gt37vgt

use a 3/8 extenstion in the plug hole mark when the piston is 10mm from the top rising and falling then mark betweeen the 2 marks thats TDC as the top bit is too tricky then nuber one piston on the cam is rocking on over laps between lobes and #3 shouls be on the firing with the lobes pionting up away from the lifters

Jfrahm

Actually that's backwards. The cam runs at 1/2 crank speed. It takes two revs of the crank to get the cam mark to come back around.

The cam mark is great because finding the mark on the crank can be difficult, at least the one in the window on top of the bellhousing can be. the mark should be should be much easier to find if you bring the cam mark up and then look for the crank mark. Might have to roll the crank around a bit if the cam mark is not exactly straight up timed after years/miles of belt wear.

-Joel.

Darwantae951

Thank you for the correction, you are right. But relying on the cam mark alone is still not a good idea. You have to be sure you are indeed at TDC.

-Darwin

My above post was edited to be correct.