Confirmation of 20 degrees past TDC

Crankshaft (at the flywheel).

 

Does anything like that exist for the 2V motors?

 

I just completed installing my new cam belts. I use the tension method by rotating the engine and watch for the stretcher (tensioner) to be at it's most extended position and then tighten the 19 mm bolt to 41 Ft-lb. I did this for both banks and they were at different amounts of turn on the crank of course. I too came across the same service bulletin and had the same question. I suppose 20 degrees past TDC for Cyl #1 is a simple as it sounds - rotate the the crank 20 degrees from TDC mark (I marked the harmonic balancer at #1 TDC. I must say that the stretcher was at a more extended position with the crank rotated about 90 degrees so I'm a bit concerned that the belt is too tight.

Anyway, I can redo it from TDC #1 and go only 20 degrees. But how do I know when/where TDC is for #8 cyl in order to do the same for the other bank? I'm anxious to close it all back up and get it on the road. Thanks in advance!

 

bump... need to know how to check when Cyl #8 is TDC. Then I can rotate crank 20 degrees and tighten cam belt tension. Thanks for any help!

 

No, it would actually be cylinder #5 to be analogous, but #5 & #8 are at TDC at the same time -- there are another set of marks on the flywheel (i.e., PM1-4 mark = TDC cyls #1 and #4; PM5-8 mark = TDC cyls #5 and #8).

You did rightly -- tighten when the tensioner bearing plunger is at its maximum extension out of the body. IIRC, the "20 deg" is not only 20 deg past #1 TDC but also for the #1 TDC event that corresponds to #1 firing point. Were you on the correct revolution for that when you marked the harmonic balancer?

 

Thanks Steve... I don't know to be honest. I checked the flywheel and saw that the PM1-4 was lined up and I checked the cam marks looking through the oil filler and saw that they were lined up. I marked the harmonic balancer at that point for my own reference. Now I had cam gears marked (and locked) with a straight edge for reference. All stayed in time when i rotated after belts installed and locks removed.

So are you saying that if I see the 2nd mark for TDC 5-8 on the flywheel and position the pointer to line up then I will be at #5 (and #8) TDC? I can't see marks on the cams since the covers are still on. So not sure if I need to rotate the crank more than the 90 degrees (that's the distance in degrees between the TDC mark for #1 and the TDC Mark for #5 on the photos of the flywheel I have seen. Am I making sense? I know that just because the TDC #1 mark on the flywheel lines up you still need to check the cam marks because you could be 180 deg out of phase. Same for TDC#5-8 I would assume. But are they in phase together so I would not have to make an additional rotation for #5-8?

So I find TDC for #1, confirm with looking through oil filler for #1 TDC, then continue to rotate the crank another 90 degrees and line up the TDC #5-8 mark and good? Or will I be out of phase or something?

Thanks so much!

 

Correct.

Another way to check it on the 5-8 bank is (with the flywheel at the PM5-8 mark) take off the distributor cap and confirm that the distributor rotor is generally pointing at the contact in the dist cap holding the #5 spark plug wire.

 

That makes a lot of sense... thanks again for the help!