Fresh Engine
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Fresh Engine

  1. #1
    Member apollo18's Avatar
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    Default Fresh Engine

    After a rebuild, how long can a engine sit before you run it? Its been a couple years and i wasnt sure if i could just prime the oil pump and then run it or do i need to do something else first.

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    Senior Member EVILFORCE's Avatar
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    Depends on how good it was when put away. Even assembly lube turns to gunk when you store it a long time. If it is a high dollar unit I would at least pull pan and bearings and make sure they are still wet.
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    Member apollo18's Avatar
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    It never really had oil in it. I did fill it and primed it and turned the motor but that was a while ago.

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    Senior Member jetboatperformance's Avatar
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    Apollo is this Flat tappet cam deal ??

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    Boat Nut sleekcrafter's Avatar
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    Pull the plugs, squirt MM oil in the cylinders, pull the dissy and prime it for 5 minutes. Roll it over by hand, then prime it for another minute. Might want to add Zinc break-in additive and some fresh oil as well.
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    Member apollo18's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Apollo is this Flat tappet cam deal ??
    Yes it is a flat tappet cam deal =-)
    Last edited by apollo18; 04-22-2011 at 05:35 PM.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    Pull the plugs, squirt MM oil in the cylinders, pull the dissy and prime it for 5 minutes. Roll it over by hand, then prime it for another minute. Might want to add Zinc break-in additive and some fresh oil as well.
    Sage advice right there!
    Quote Originally Posted by apollo18 View Post
    Yes it is a flat tappet cam deal =-)
    I'd probably pull the rockers , pushrods , lifters and relube the cam as best you can

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    Member apollo18's Avatar
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    Thats what i thought. If not done properly whats the worse that could happen? the cam could be destroy???

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by apollo18 View Post
    Thats what i thought. If not done properly whats the worse that could happen? the cam could be destroy???
    Setting that long its hard to day depends on if they used liquid lube or paste , might be fine your kinda rolling the dice maybe use a flash lite or borescope and peek down in there ?

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    Member apollo18's Avatar
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    The breakin lube was a red paste. Same consistency as grease. But i have spun the engine by hand and i bet that stuff is gone.

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    The Man cordog009's Avatar
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    If you could, pull all the caps and check the bearings to see if they're dry. Throw some good assembly lube on them and re-torque. Fog the cylinders with MM oil incase some rings have wanted to stick. Put in some new oil and prime the pump and check the oil coming out of the rocker arms. A dab of assembly lube on the rollers/valve tips would help too. Make sure you have one of the priming tools that blocks the lifter valley so you get pressure up to the valvetrain. Turn the motor over by hand and see how it feels. With the flat tappet cam, a zinc additive and some good breakin oil will be your best friend.


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    Some guy obnoxious001's Avatar
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    Using an oil pump priming tool, the main and rod bearings will be oiled, particularly if you turn the engine over with a wrench on the balancer bolt.

    My concern would be the cam lube, not the bearing "assembly"lube. My feeling is that assembly lube is necessary to prevent damage to bearings during assembly,, including turning the engine over to adjust valves, etc. I would assume that normal engine priming blasts most or much of the assembly lube out pretty quickly.

    The cam lube, on the other hand, may be a problem. I don't really like the newer type red cam lube supplied by some companies, instead preferring to use the old Isky Rev Lube when I put together a flat tappet cam engine. Some of the red cam stuff seems like it drips off pretty quickly.

    As far as your question about "the worst it could do",, if you flatten the cam,, metal distributes itself around the engine,, embeds itself in piston skirts,, gets into bearings,, etc.

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    Member hollbrow's Avatar
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    Default Fresh engine

    Take Sleek's advice to heart- also make sure that your valve guides are freed up good- remove springs and seals and get some penetrating oil down them and move them by hand if not sure- priming wont get oil directly to them. I have had guides stick on engines that sat up. I'm dealing with valvetrain issues from cranking/running it without being sure guides were free.

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    The Man cordog009's Avatar
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    You might want to check your valve spring pressures too. Depending on how the large the cam is, there will be some valves at max lift or so for a long period of time and that can weaken the springs over time. Just something you might want to check too.


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