cam timing on refitting (need help)

1659 Views 8 Replies 3 Participants Last post by lshadoff, Nov 28, 2004

p10driver

Discussion Starter · Nov 27, 2004

OK. I've done a mistake when building up my SR. The oil pump, oil sump are mounted. The chain was aligned with the mark on the crank shaft but I have trurned the engine so now I have no idea where it is and have to time the cams.....

Is this procedure corect:

Crank at TDC. Exhaust cam sprocket locating pin at 12 o'clock. Intake cam locatibg pin at 10 o'colck. The marks on the chain and the sprocket marks are aligned.

But there is no way to check if the crank sprocket mark is aligned with the chain mark....

Help!!!!

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Slacky

· #2 · Nov 27, 2004

doesnt need to be really, its just a extra guide that really helps if u did it right, as long as u are at top dead center and have both gears in the right spot with rouchly 19 or 20 links in between the timing marks then u are ok, i cant remember which number u might wanna look it up, o yea and make sure the chain sits on the hydrolic tensoner corectly and dont realease it till u are done or u will have to go through all the fuss again, good luck

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lshadoff

· #3 · Nov 28, 2004

With the #1 piston at TDC and crank keyway at 12 o'clock align the mark on the crank sprocket with the timing chain link with a mark (dot on gold link) on it. Count 56 rollers (going clockwise) from the crank mating mark to the mating mark on the intake sprocket (closest to the firewall). There should be a silver link at this location. Count 20 rollers to the mating mark on the exhaust cam sprocket (another silver link). There are then 48 more rollers back to the gold link on the crank sprocket.

Lew

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Slacky

· #4 · Nov 28, 2004

good man

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p10driver

Discussion Starter · #5 · Nov 28, 2004

lshadoff said:
With the #1 piston at TDC and crank keyway at 12 o'clock align the mark on the crank sprocket with the timing chain link with a mark (dot on gold link) on it. Count 56 rollers (going clockwise) from the crank mating mark to the mating mark on the intake sprocket (closest to the firewall). There should be a silver link at this location. Count 20 rollers to the mating mark on the exhaust cam sprocket (another silver link). There are then 48 more rollers back to the gold link on the crank sprocket.

Lew

I know. But as I said before the engine is alredy put together. The timing chain cover, aluminium oil sump and stell oil sump are mounted. And I would not like to remove it again.

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p10driver

Discussion Starter · #6 · Nov 28, 2004

Have put it apart again... All the marks were aligned the right way, but will sleep beter now

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lshadoff

· #7 · Nov 28, 2004

From the B14 FSM:

Lew

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p10driver

Discussion Starter · #8 · Nov 28, 2004

Yeah. Have seen it in AutoData and Haynes but was not shure that the chain was corectly aligned at the crank sprocket.

And it's way to expensive to make a mistake....

It took 3h of work to put it apart, check , clean and reseal it.....

Now I know for the next time

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lshadoff

· #9 · Nov 28, 2004

p10driver said:
Yeah. Have seen it in AutoData and Haynes but was not shure that the chain was corectly aligned at the crank sprocket.

And it's way to expensive to make a mistake....

It took 3h of work to put it apart, check , clean and reseal it.....

Now I know for the next time

For all work on the engine internals, the FSM recommends setting the crank at TDC on the compression stroke. All diagrams are for this crank position (where it makes a difference). This is done for so that if the crank is inadvertently moved it can be set back to that reference point for all measurements, settings, and specifications.

Lew

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