Valve train noise
#1
Valve train noise
I have a 1970 Oldmobile 442 with a 455 CID engine. It overheated on me a year ago and has since made a clacking noise that sounds like it is coming from the valve train. I have replaced the lifters and push rods and the noise seems to have decreased a little. I believe what happened when the engine over heated it loosened some gunk in the passages and now one or more are blocked and the lifters are not getting enough oil. I have run motor flush through a couple of times and I am driving once a week to get engine up to normal operating temperatures in the hope that it will clear the blocked passages. Any suggestions? Thanks.
#4
thanks for both of your suggestions. I have not checked the cam lobes but I have changed the rocker arms. Another reason I believe the oil passages are blocked is after I changed the parts I left the valve covers off and very little oil was coming out of the push rods. just a dribble. after I used the engine cleaner a few had oil shooting out, which I am assuming is more normal. Again thanks for your suggestions.
Thread
Thread Starter
Forum
Replies
Last Post
ragtop70
Small Blocks
29
September 3rd, 2012 10:15 AM