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Timing issue with Timing marks

 
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Old 06-22-2015, 09:00 AM
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Timing issue with Timing marks

So im going to be installing the timing belt back on the prelude.
I notices the timing marks are slightly of, im wondering if that's because I have the front of the car jacked up, and I will be perfect when everything is installed and leveled out. I tried turning them slightly but then the cam jumps a quarter of a turn. Been a while since Iv done this and don't remember having this problem. If anyone has any insight on this I would love some info.

Car is a 2001 Prelude (base)
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Old 06-22-2015, 11:38 AM
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Re: Timing issue with Timing marks

The engine can be upside-down but you can still put it in time. All the timing marks are relative to the engine, not the car.

HOPEFULLY you put everything @ TDC before taking the belt off.
If so, the crank should still be @ TDC. Unless you physically rotated the crank with the belt off, there's nothing internally in the engine that should be trying to rotate the crank.

IIRC, it's the intake cam that remains @ TDC with the belt off, but it's the exhaust cam that is trying to rotate due to the cam springs, correct?
If so, I'm pretty sure I; (with the belt only around the exhaust cam gear) used a wrench to rotate the exhaust cam back to TDC, than wrap the belt around the crank gear with NO slack (which will help prevent the exhaust cam from spinning).
Than put the belt around the intake cam with NO slack, and all the slack in the belt should be in the tensioner area, helping you slip the belt over the tensioner.

As always it helps tremendously to have a helper holding the cams @ TDC while you do the belt, altho it IS possible doing yourself, just a PITA
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Old 06-22-2015, 05:00 PM
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Re: Timing issue with Timing marks

Quote:
Originally Posted by twokexlv6coupe View Post
The engine can be upside-down but you can still put it in time. All the timing marks are relative to the engine, not the car.

HOPEFULLY you put everything @ TDC before taking the belt off.
If so, the crank should still be @ TDC. Unless you physically rotated the crank with the belt off, there's nothing internally in the engine that should be trying to rotate the crank.

IIRC, it's the intake cam that remains @ TDC with the belt off, but it's the exhaust cam that is trying to rotate due to the cam springs, correct?
If so, I'm pretty sure I; (with the belt only around the exhaust cam gear) used a wrench to rotate the exhaust cam back to TDC, than wrap the belt around the crank gear with NO slack (which will help prevent the exhaust cam from spinning).
Than put the belt around the intake cam with NO slack, and all the slack in the belt should be in the tensioner area, helping you slip the belt over the tensioner.

As always it helps tremendously to have a helper holding the cams @ TDC while you do the belt, altho it IS possible doing yourself, just a PITA
Both intake and exhaust cams need to be held to be perfect. I'll prob have to wait till I can get someone else to hold the cams tdc
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