Losaun Posted December 13, 2009 Share Posted December 13, 2009 I am installing a new engine in my 1993 lexus gs300. I attempted to spin the crank on my new engine and it reaches a point where it is really difficult to turn. I actually have to place a leverage bar on it to continue to spin through the cycle. It is not a compresson point though. Could this issue be that the engine is locked up? Please advise. Also when I attempt to spin the crank on my old engine is has resistance but still spins. It is no where near as hard to spin as my new engine. Could this be because there is not oil in the new engine? Quote Link to comment Share on other sites More sharing options...
SRK Posted December 13, 2009 Share Posted December 13, 2009 Spin it will the spark plugs out. It may have an oil caused hydraulic lock, if it was shipped on it's side. Removing the plugs will confirm and cure that. If the tight spot remains, then water may have got into a cylinder and caused rust, which will also cause it to be tight. Remove the valve cover and watch the valve movement. If any have excessive "lash" then that valve is bent. Perhaps it tossed the timing belt in the past. Don't install it until you figure it out - it should move very smoothly with the plugs out. You also don't specify what you mean by "new engine" - rebuilt or wrecking yard? Quote Link to comment Share on other sites More sharing options...
Losaun Posted December 16, 2009 Author Share Posted December 16, 2009 Spin it will the spark plugs out. It may have an oil caused hydraulic lock, if it was shipped on it's side. Removing the plugs will confirm and cure that. If the tight spot remains, then water may have got into a cylinder and caused rust, which will also cause it to be tight. Remove the valve cover and watch the valve movement. If any have excessive "lash" then that valve is bent. Perhaps it tossed the timing belt in the past.Don't install it until you figure it out - it should move very smoothly with the plugs out. You also don't specify what you mean by "new engine" - rebuilt or wrecking yard? Sorry about that homie, it is a used engine from a 96 SC300 81K. So what you are saying is remove all of the plugs and then try and spin the engine again correct. What do you mean by "lash". Thanks for responding.. Quote Link to comment Share on other sites More sharing options...
SRK Posted December 16, 2009 Share Posted December 16, 2009 Lash is the distance from the cam lobe to the follower on top of the valve spring. If the valve is bent it won't seat properly and leave a huge gap for lash, instead of the rather tight proper clearance. You'll see. Yep, pull the plugs to check for hydraulic lock. Quote Link to comment Share on other sites More sharing options...
PrinceAli132 Posted December 17, 2009 Share Posted December 17, 2009 How long has it been since this motor has run or been turned over? If it has been a while, it wouldn't hurt to put some oil on the cylinder walls or even some WD-40. Ali Quote Link to comment Share on other sites More sharing options...
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