Valvetrain noise concern
#1
Valvetrain noise concern
I just finished my 383 lt1 build and have now put on about 900 miles on it (brand new forged block). All the parts on my build have broken in and now im hearing a tick from under the valve covers.. I know its from the rockers being a little loose from me setting the valve lash. I am running 1.6 rr's with poly locks. I am wondering if the ticking noise from the rockers being slightly loose is dangerous too my motor. My other cam only build sounds the same way. I am running Canton valve covers and the are the biggest PITA to install so id very much rather not take them off. lmk what you guys think. Thanks
#2
assuming you adjusted the valves correctly they should not need re-adjusting
RR do make a "sewing machine" sound. If you have one distinguishable "tick" "maybe" that valve needs re-adjusting
Use a mechanics stethoscope along VC and each exhaust port to see if one cyl/valve makes more/different noise than the others
Also a exhaust leak can also make a "tick" sound
RR do make a "sewing machine" sound. If you have one distinguishable "tick" "maybe" that valve needs re-adjusting
Use a mechanics stethoscope along VC and each exhaust port to see if one cyl/valve makes more/different noise than the others
Also a exhaust leak can also make a "tick" sound
#4
assuming you adjusted the valves correctly they should not need re-adjusting
RR do make a "sewing machine" sound. If you have one distinguishable "tick" "maybe" that valve needs re-adjusting
Use a mechanics stethoscope along VC and each exhaust port to see if one cyl/valve makes more/different noise than the others
Also a exhaust leak can also make a "tick" sound
RR do make a "sewing machine" sound. If you have one distinguishable "tick" "maybe" that valve needs re-adjusting
Use a mechanics stethoscope along VC and each exhaust port to see if one cyl/valve makes more/different noise than the others
Also a exhaust leak can also make a "tick" sound
#5
Yeah it is odd that exploding wallet $ needle bearing trunnion w/roller tip RR will make more "noise" than a stamped piece of metal riding on a valve tip and PR and pivoting on a rounded fulcrum...but they do make a "noise"...often referred to as a "sewing machine" type of sound
Also for people using the stock valve covers, you need to cut off part of the baffle inside the VC to clear the RR unless you use Crane Gold "narrow body (GMPP) 3/8 RR. Aftermarket VC should allow for more room and not require any trimming
Also for people using the stock valve covers, you need to cut off part of the baffle inside the VC to clear the RR unless you use Crane Gold "narrow body (GMPP) 3/8 RR. Aftermarket VC should allow for more room and not require any trimming
#6
Have you rechecked the valves? After getting my top end done, I found out that I had accidentally messed up a single rocker's adjustment, and it was making a faint clacking sound. All it took was pulling off the VCs and a bit of jiggling on the rockers to find it.
#7
If you "hear" what you think is a lose RR and can pin point it by listening with a stethoscope with engine running...then you need to re-lash that valve. Even after you lash it with the engine off...in a few minutes the lifter bleeds down some and the RR will be "lose"...normal. It will be good once engine starts
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#8
Mine was more of an "oops" case, granted. I turned the allen key down a bit by accident before tightening the nut. All of my rockers have some play, but that one was bouncing around like an ADD 6 year old after raiding his Halloween stash, and it wouldn't have any tension on it til the lifter was halfway out of the bore.