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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Valve train noise 525 efi after top ends (https://www.offshoreonly.com/forums/general-q/362360-valve-train-noise-525-efi-after-top-ends.html)

HyFive578 08-10-2019 02:03 PM
When you replaced the rockers, did you reuse the OEM polylocks or use the ones that came with the Harland Sharpes? The OEM polylocks are shorter than the ones that usually come with other brands and the valve covers could be hitting them.

F-2 Speedy 08-10-2019 02:28 PM
you said one of your engines, twin engines, one is stock and the other one is not ?

Baja Rooster 08-10-2019 05:54 PM
Originally Posted by zz28zz (Post 4701452)
Are you sure the rockers aren't hitting valve covers? Have you run it with valve covers removed?
Good point. I’d back off the preload a half turn and run with the valve covers off before swapping out parts.

Griff 08-11-2019 12:06 AM
Originally Posted by AllDodge (Post 4701447)
Some find zero lash different then others. Never done a 525, but zero to me is when there is no up/down movement, but turning the rod can still be done. Others do zero as when rod cannot be turned
Yep, you should be able to spin the push rod. There should be no pressure on it.
Easiest way to do it is with the intake manifold off. Then you can actually see when the lifter compresses.

382fastechh 08-11-2019 10:58 AM
Originally Posted by F-2 Speedy (Post 4701461)
you said one of your engines, twin engines, one is stock and the other one is not ?
yes, I'm only doing one engine at the moment, had a pushrod pop off a rocker due to a valve stuck in the guide. Trying to get it back on the water asap so I'm not wasting the entire short summer here in Vermont.

382fastechh 08-11-2019 11:27 AM
Originally Posted by HyFive578 (Post 4701458)
When you replaced the rockers, did you reuse the OEM polylocks or use the ones that came with the Harland Sharpes? The OEM polylocks are shorter than the ones that usually come with other brands and the valve covers could be hitting them.
I used the polys that came with the rockers, the center pin on the harlands is recessed, the installed height of the poly is lower than the top of the rocker arm. I'm gonna run it today with covers off and see what happens.

F-2 Speedy 08-11-2019 11:47 AM
just curious why you didnt stay with the OE lifters and push rods unless the Dart heads didnt allow for it

382fastechh 08-11-2019 11:56 AM
I wanted to freshen everything from the cam up. Hours since last rebuild are unknown. The pushrods had to be lengthened .250" for the dart heads.

1MOSES1 08-11-2019 12:06 PM
Originally Posted by 382fastechh (Post 4701445)
what issue did you have with morels??
Had two 500efi’s refreshed including new lifters. Had issues with both motors from the get-go. Lifters did not want to stay pumped up. Thing sounded like a tractor at idle. Played with pre load and oils. Nothing worked. Ended up replacing with Johnson’s. Problem went away and haven’t had an issue since *knock on wood*


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