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-   -   engine noise? (https://www.offshoreonly.com/forums/general-q/207097-engine-noise.html)

4mulafastech 04-20-2009 10:03 PM


Originally Posted by blue thunder (Post 2848266)
For your problem I would guess you installed the timing gear wrong on the crank and what you are hearing is the valves tapping on the pistons. If you have a crank gear with multiple keyways it is easy to do. Don't ask how I know this. Did you degree the cam in?

BT :cool:

BT, how do you know this? lol!

20 years ago, 427 bbc alcohol drag motor, Cloyes trueroller, multipe keyway crank gear, takes the time to CAREFULLY degree in solid lifter Ultradyne cam, uses offset bushing in cam gear to get it just right, disassembles engine for final cleaning, you know the rest... Yes, it's easy to do, ONCE!:drink:

Fixxxer22 04-21-2009 05:25 PM

ok here is what i found.... the intake rocker arm of cylinder 5 was chattered off of its mount and the pushrod was destroyed at the rocker arm. it sent the end ball about half way down the pushrod causing it to split. the exhaust side pushrod was bent into an s shape. the lifter looks fine and both pushrod ends at the lifters looked good. i used a borascope and found no signs of contact between the piston and valves. this may have been my noise. i prob. should have adjusted the valves again. i dont know what i did wrong. i have big gil anti-reversion tails and my manifolds pass at 20 psi submerged in a garbage can full of water. WHAT DID I DO?

800XCR 04-21-2009 06:14 PM

You adjusted the valves wrong.....look up the proper sequence and procedure, put it back together and hope for the best......you may have a bent valve or two. The lifters should be fully primed.

jeffswav 04-21-2009 06:50 PM

What version of BB are you running? Do you have the Mark IV or GenV cam or the Gen VI with the stepnose? I just learned today how to adjust the cam endplay. If it is not set correctly you can have big problems.

Fixxxer22 04-21-2009 07:34 PM

take a look...... i am going to go back through the entire valvetrain. i set them up empty lifters (brand new) adjusted to zero lash and then 1/2 turn after. http://i91.photobucket.com/albums/k3...2/IMG_0939.jpg

Fixxxer22 04-21-2009 07:47 PM


Originally Posted by jeffswav (Post 2849601)
What version of BB are you running? Do you have the Mark IV or GenV cam or the Gen VI with the stepnose? I just learned today how to adjust the cam endplay. If it is not set correctly you can have big problems.

gen v block and gen 6 cam no button... using the gm performance bracket and single roller chain. the cam cannot walk due to the bracket between the sprocket and block. :ernaehrung004:

Velocity Vector 04-21-2009 08:07 PM

I pray the wiggling pin hasn't fallen out the wobbling hole.

lkn-velocity 04-21-2009 08:42 PM

were the valve springs matched to the cam for pressure and lift? possible coil binde as stated before.

Fixxxer22 04-21-2009 09:08 PM


Originally Posted by lkn-velocity (Post 2849702)
were the valve springs matched to the cam for pressure and lift? possible coil binde as stated before.

145 lbs installed.... i think this lifter set might have bottomed before i hit zero lash and i didnt feel it due to them being new. and they pumped up and screwed up the whole mess. i suck! this is my first BBC ever!:mad:

Griff 04-22-2009 01:23 AM

It is easiest to adjust the valves with the intake off. Then you can actually see when you are at zero lash.

http://www.cranecams.com/?show=hydraulicLifters


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