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Old 08-25-2017, 09:16 AM   #21
OldNuc
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1998 SC2
Default Re: A CM off TDC for timing

Quote:
Originally Posted by 2000sl1blue View Post
Is it possible to pull the pan with the engine in the car? It seems like the bolts for the pan aren't able to be accessed next to the flywheel. And I'm never pulling another engine again now even to salvage this rebuild hahahaha. I'm willing to drop the pan again, but I don't know how much further I'll go. I might just hook it to the starter and see what happens at this point
If it is an automatic you can get the pan out. Might have to drop the head pipe as well. If you disconnect it behind the cat and at the manifold you can rotate the REAR end to the LEFT side of the car and it will drop clear of the radiator etc. If careful you do not have to disconnect the rear O2 sensor either.

If you do not have the timing chain on and the cam sprocket is not pinned to TDC the valves will not lock the engine, they bend very easily.

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Old 08-25-2017, 09:32 AM   #22
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1998 SC2
Default Re: A CM off TDC for timing

FYI plastigauge has been repeatedly demonstrated to be quite inaccurate. Direct measurement is required for accuracy.

The pan can also be removed if a manual trans but you will have to buy a new one as the rear corners will have to be cut/bent to get it out of the flywheel.

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Old 08-25-2017, 10:07 AM   #23
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2005 VUE 2.2L
Default Re: A CM off TDC for timing

Quote:
Originally Posted by OldNuc View Post
FYI plastigauge has been repeatedly demonstrated to be quite inaccurate. Direct measurement is required for accuracy.
Of course, just use as a go /nogo indicator for crank/rod bearings

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Old 08-25-2017, 12:01 PM   #24
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1998 SC2
Default Re: A CM off TDC for timing

If you use a good quality assembly lube and then check for free rotation after each bearing is installed and torqued this eliminates the need for plastigauge.

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Old 08-25-2017, 12:41 PM   #25
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Default Re: A CM off TDC for timing

If those piston/rings got put in dry, I think a ring has probably broken or otherwise galled to a cylinder wall. If the OP doesn't want to remove the engine and inspect it properly, it is toast. Let it RIP.

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Old 08-26-2017, 07:20 PM   #26
Highmile
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Default Re: A CM off TDC for timing

I'm betting piston to valve interference.

So if this is a single cam motor you should be able to loosen the caps on top of the cam until all the valves are close.

The down side if this is the case you may have put enough pressure on a valve to bend it. So once in time then put the chain on, tighten the cam caps and run a quick compression test.

Best part it is quick and easy to loosen the caps to check for interference

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Last edited by Highmile; 08-26-2017 at 07:25 PM..

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Old 08-26-2017, 08:35 PM   #27
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Default Re: A CM off TDC for timing

The OP reported (reply #14) that the rocker-arms aren't in yet; not much chance any valves have hit a piston.

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Old 08-26-2017, 10:15 PM   #28
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Default Re: A CM off TDC for timing

Quote:
Originally Posted by OldNuc View Post
If you use a good quality assembly lube and then check for free rotation after each bearing is installed and torqued this eliminates the need for plastigauge.
THe context I was envisioning was using it as a clearance gauge- measuring the thickness of the squashed Pgauge with a cheap dial indicator after the caps were installed( then removed to access) .
Maybe a piece of grit was trapped under a crank main bearing. Or just wrong thickness.

Or what you suggested, dry/broken rings. I can't imagine going to all that trouble and not using lube on the rings.

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Old 08-26-2017, 10:18 PM   #29
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Default Re: A CM off TDC for timing

Quote:
Originally Posted by billr View Post
The OP reported (reply #14) that the rocker-arms aren't in yet; not much chance any valves have hit a piston.
Good catch,,, I guess that leaves just dry rings and( more remote) binding crank/rod bearings.

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