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Engine Pre-Lube

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Josh

07-29-2004 06:32:20




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I have heard people say before that when they put an engine back together after a rebuild that they use engine pre-lube. Has anyone ever heard of this? Is it something you should always use? And what exactly does it do? Thanks for everyone's help




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Mark W.

07-30-2004 09:47:53




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 Re: Engine Pre-Lube in reply to Josh, 07-29-2004 06:32:20  
Josh:

I think Bob M. really has it right.

On the car engines I've rebuilt, I've used "assembly pre-lube" on the cam and lifters, and motor oil (liberally) everywhere else -- especially the pistons, rings, and the bearings on both ends of the rods.

I remember reading in some manual that a non-prelubed cam can be "wiped" by the lifters and ruined within 30 seconds after startup. They didn't say exactly how or why, but the statement stuck with me so I've always used the pre-lube.

Mark W.

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steve c

07-29-2004 12:48:46




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 something to think about in reply to Josh, 07-29-2004 06:32:20  
i will add in addition to the prelube on rebiuld, what we do extra is before u start the tractor leaving the spark plugs out, and pull it in gear making the engine turn freely and working the oilpump, this helps in prelubing before start up hope this help steve c



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lee

07-29-2004 11:43:47




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 Re: Engine Pre-Lube in reply to Josh, 07-29-2004 06:32:20  
These old motors are pretty forgiving but you might get in trouble if you use just any gun grease. A thick heavy grease would be a no no
as well as a high temperature grease. You want something that will dissolve readily in the oil
and not clog any oil passages. I would recommend an engine assembly grease such as Lubriplate 105 made for the purpose. For the cam and lifters I would use a specific cam and lifter pre-lube such as Sealed power LL5. These products are used by automotive performance engine builders. They are readily available at auto parts stores. Why not treat that tractor right.

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Red Dave

07-29-2004 11:10:43




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 Re: Engine Pre-Lube in reply to Josh, 07-29-2004 06:32:20  
I use assembly lube that's made for engine assembly. Comes in a tube, got it at NAPA.
Just about any lube that will stay in place until its ready to run would work. Just use something, I wouldn't reassemble dry.



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El Toro

07-29-2004 10:30:14




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 Re: Engine Pre-Lube in reply to Josh, 07-29-2004 06:32:20  
Hi Josh, We always prelubed an engine prior to startup. We put a pipe tee in the block where the
oil pressure gauge goes and used a pressure vessel
to force oil throughout the engine until oil pressure is shown on the gauge. We coated the bearings with lubi-plate and with engine oil too.
We oiled the cylinders and pistons with a heavy coating of oil.

On some engines I've removed the distributor and spun the oil pump with a drill motor. Always prime the oil pump prior to installing it on the engine. Some foreign engines
have the prelube feature that they use every day
prior to starting the engine. Good Luck, Hal

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Bob M

07-29-2004 06:49:21




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 Re: Engine Pre-Lube in reply to Josh, 07-29-2004 06:32:20  
Josh - Prelube is required to protect rubbing components until normal lube oil flow is established on the first start. I think there exist special "pre lube" products for this purpose. However myself for bearings (rod, main, cam, etc - also cam lobes) I use a light coat plain old gun grease during assembly. And for pistons I simply oil them with regular motor oil.

Also before starting the engine the first time I put another squirt of oil down each plug hole, then crank the motor with the plugs out until oil pressure begins to show on the gage. I then put in the plugs, fire it up!

Haven't had a lube-related problem yet...

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Chris Brown

07-29-2004 06:46:47




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 Re: Engine Pre-Lube in reply to Josh, 07-29-2004 06:32:20  
They make an assembly grease you put on all the moving parts when installing them. I have always used stp or the cheap wal mart brand of it. It is gooey and does'nt drip off like just mtotr oil. If I was working on an engine that was going to have to sit for a long time before trying to start it I would definately use the assembly grease lube.



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