valve seal question
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Senior User
Joined: Jun 2000
Posts: 234
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valve seal question
ok i have a 1989 f250 with a 351w and it started making a strange rattling noise the other day. well me and a friend of mine pulled the intake and valve covers to check the valve springs, which was not the cause of the rattling noise, but it did cause me to find out that 6 out of 16 valve seals were either installed incorrectly or the wrong type installed. now my question is would the bad valve seals cause my motor to be weak and have bad fuel mileage? which is the reason i'm going to sell it when i get it fixed. unless the power issue and fuel mileage can be solved.
thanks
LR
thanks
LR
Post Fiend
Joined: Feb 2001
Posts: 6,328
Likes: 124
From: Iowa
valve seal question
No, it won't affect your performance. Assuming they aren't allowing oil to enter the cyllinders to the point af fouling spark plugs. A lot of racers don't even bother installing valve guide seals.
Posting Guru
Joined: Aug 2002
Posts: 1,214
Likes: 2
From: Minneapolis, MN
valve seal question
One problem that can develop with bad valve seals is when the oil drips down the valve stem, it can cook on the hot valve stem and build up to the point of choking the flow through the port. Race engines won't have this problem as they are usually torn down long before much if any build-up can occur.
