QUESTION!

"Bandit" (2bandit) 08/31/2013 at 14:45 • Filed to: emma

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So my camshaft is installed, it is impossible to spin by hand. When I put the timing gear on (I get a little bit more leverage) it is pretty easy to spin. Would this be due to all new metal bits that will wear down over time combined with my glue-like assembly lube?

ChiffChaff > Bandit 08/31/2013 at 15:01

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Just my one/fourth sense; "spins-4-grins" is probably not the best idea. If you've lubed it properly, then set it (align at timing marks per spec) and forget it.

Takuro Spirit > Bandit 08/31/2013 at 15:21

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Yes.

Pretty sure.

I've only replaced cams in OHC motors.

JasonStern911 > ChiffChaff 08/31/2013 at 15:47

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Pretty much this.

If your timing chain/belt is attached, turning the motor over by hand to ensure nothing binds before final assembly and using a "significantly higher torque providing" starter motor is smart. But if your timing chain/belt is not attached, then causing the valves to open while the pistons are not moving has a reasonable chance of causing the valves to slam into the stationary pistons in an interference engine.

BJohnson11 > Bandit 08/31/2013 at 16:00

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As others may have said, turning the cam alone will be tough if the lifters, pushrods and heads are also in. Because when you spin the cam, you are trying to open the valves as well, which are held down with pretty heavy springs.

theonetruetom > Bandit 08/31/2013 at 16:26

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The valvetrain is the highest resistance part in the entire engine. But as others have said, please don't turn it without the timing chain on. In an interference engine, you can bang the valves on the pistons and then you're in for a whole world of pain in the pocketbook. In a noninterference engine, it's less of an issue, but still. Get it to the timing marks and get it lined up.

NipperDawg > Bandit 08/31/2013 at 16:31

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Lack of leverage, the thick assembly lube, the mass of the camshaftand the natural drag of the tight fitting bearings. Nothing to worry about.