help please
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Welcome to the forum
Check in the 335 engine series forum.
That's where engine questions are asked
Maybe read post #1 in this thread as well
https://www.ford-trucks.com/forums/s...d.php?t=102632
Check in the 335 engine series forum.
That's where engine questions are asked
Maybe read post #1 in this thread as well
https://www.ford-trucks.com/forums/s...d.php?t=102632
Postmaster
Joined: Jul 2005
Posts: 3,248
Likes: 0
Welcome.
What allowance? we need more of a description. Check this thread https://www.ford-trucks.com/forums/s...d.php?t=450139
What allowance? we need more of a description. Check this thread https://www.ford-trucks.com/forums/s...d.php?t=450139
Posting Guru
Joined: Aug 2000
Posts: 2,416
Likes: 4
From: PacNW
I've never heard of lifters "pinging". If you mean that they are making a tapping noise then you either have an oil pressure problem, bad lifter(s) or a bad cam. The 351M/400 does not have an adjustable valvetrain. The rockers are held in by a 5/16" bolt that is "set it & forget it". If the motor hasn't been messed with and you have noises coming from the valvetrain then you have a problem and there simply isn't any adjustment that will fix it.
Posting Guru
Joined: Dec 2002
Posts: 2,003
Likes: 2
From: chicago burbs
pinging is also refered to as "spark knock" or "detonation" and occurs in the combustion chamber. the sound is made from the irregular burning of the air/fuel mixture, it's like an explosion echo. it almost sounds like metallic noise but it's not. some people call detonation "lifter rattle" but the two are very different.
try some premium fuel when the tank is almost empty and see if the pinging isn't gone or at least lessened. also verify that you have good oil pressure, without oil pressure the lifters will be collapsed and will make noise.
try some premium fuel when the tank is almost empty and see if the pinging isn't gone or at least lessened. also verify that you have good oil pressure, without oil pressure the lifters will be collapsed and will make noise.
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New User
Joined: Sep 2005
Posts: 5
Likes: 0
thank you very much. i did not know they were not adjustable. it is probally the cam and or the oil pump. some times my pressure is low but not in the dangerously low catagory. i plan on rebuilding my other motor i just need this one to last till then.
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Postmaster
Joined: Jul 2005
Posts: 3,248
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If installing a performance cam, then install the 2 spring per valve or 3 spring per valve.
With a new cam always install new lifters and lube the new cam and lifter prior to installation with cam lube oil. Follow installation and break in procedure with new cam.
With a new cam always install new lifters and lube the new cam and lifter prior to installation with cam lube oil. Follow installation and break in procedure with new cam.
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