Engine rebuild issues

The G-Series Tuning Forum is the place to discuss G35/G37 performance modifications and mechanical repair.
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Joined: Tue Apr 20, 2021 4:19 am
Car: 2005 Infiniti G35 coupe

Engine rebuild issues

Postby Slyshell » Wed Apr 21, 2021 2:18 am

So to the point. The mechanic that was helping my son rebuild his 2005 G35 engine was arrested and does not seem to be getting out anytime soon. Needless to say I have a mostly completed engine that has been put back together. But as I am attempting to pick up where this guy has left off, I have come across some issues that concern me on the quality of the work done. I found a broken timing chain guide and when I went to put the camshaft covers on apparently they need to be bolted in from the timing chain side as well so I had to take all that apart and that is when I noticed the guide was broken too.
Well I have now reset the timing chains all o. Their marks the engine is on TDC as the the lobes on 1 are pointing up and the crankshaft marks are all aligned.

My concern is that before I start putting the timing cover back on etc I want to hand turn the engine a few times before I continue just to make sure nothing is going to jam etc. I put the crankshaft pulley back on the sprocket and its all aligned.Tightened the bolt and all but when the bolt has been torqued all the way in and I try to turn the engine it doesn’t move. I don’t want to break the bolt so I have not attempted to apply a lot of force to try and turn it yet. My question is should it be this hard to turn and is it ok to apply more force on the bolt? If so how much more before I run the risk of the bolt snapping which I wan to avoid.

By chance I notice he had already installed the new clutch onto the back of the engine as well. Could that possibly be the reason I can’t turn it?

It’s been years since I’ve rebuilt an engine and I am quite rusty on some of the steps.

Also I am checking the clearance on the cams on the cylinders and 2 are reading at .09 is that going to be an issue later on. Because I really just wan to get the darn car back together and running for now because this job is going on 3 months now and my stress level is off the chain.
Ty Michelle

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Re: Engine rebuild issues

Postby Evergreentrees » Sat May 08, 2021 5:45 pm

Why are you doing this without the FSM open? You really do need the pdfs for all the torquing specs at the minimum and especially in the case of engine work will let you know all acceptable tolerances and clearances

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Re: Engine rebuild issues

Postby AZhitman » Sun May 09, 2021 10:14 am

Lots to digest here, but if the clutch was not aligned properly, it will bind up on the flywheel and hold the rotating assembly.

Also, plugs should be out of the engine when turning it over manually.

Since you don't know what was done internally (or if it was done right), a compression test it probably in order once you get the engine to rotate.

Definitely get the FSM (at infinitiservicemanual.com) and have it available for reference.

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