Need some quick help please
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Posting Guru
Joined: Mar 2010
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From: northern va
Need some quick help please
ok its my 1984 f150 and i went to adjust the valves due to VT noise and i got the cover off and it looks like studs so from what i read i need to TDC the piston and go one full turn past zero resistance but mine are maxed out already. are they non-adjustable?
if so than when #1 is @ TDC why am i able to move all rocker arms side to side without cycling through the cylinders? they should be tight from the preloaded lifters right?
is the cam worn out?
if so than when #1 is @ TDC why am i able to move all rocker arms side to side without cycling through the cylinders? they should be tight from the preloaded lifters right?
is the cam worn out?
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Joined: Dec 2007
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From: Boise, Idaho
Yours is more than likely the non-adjustable type.
In that case, you bring each cylinder to TDC, loosen the intake and exhaust rocker arm nuts and then retorque them to 17 - 23 ft./lbs. That's all the adjusting you can do.
If there's still rattling and looseness, your rocker arms/fulcrums/pushrods, etc. etc. may be worn. As the metal slowly wears off, the gap between each increases. Replacing them is the only fix.
If that doesn't do it, it's possible your lifters are worn out and need to be replaced.
However, before any of that, you may just have some stuck lifters that something like Marvel's Mystery Oil may clear up.
In that case, you bring each cylinder to TDC, loosen the intake and exhaust rocker arm nuts and then retorque them to 17 - 23 ft./lbs. That's all the adjusting you can do.
If there's still rattling and looseness, your rocker arms/fulcrums/pushrods, etc. etc. may be worn. As the metal slowly wears off, the gap between each increases. Replacing them is the only fix.
If that doesn't do it, it's possible your lifters are worn out and need to be replaced.
However, before any of that, you may just have some stuck lifters that something like Marvel's Mystery Oil may clear up.
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Posting Guru
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From: northern va
yeah i put it back together, i only drive it three or so times a month. if i do anything to it, it looks like comp sells a kit through summit for $300 that gives me lifters,cam,springs,locks,retainers,timing kit,ect... i guess time will tell, thanks for the advice
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Posting Guru
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From: northern va
they go up and down but all valves are closed when 1 is at TDC i would think some should be open unless the lifters are bleeding down and letting the valves close due to no oil pressure.
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Joined: Dec 2007
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From: Boise, Idaho
Even with the lifters empty of oil, they still should be opening and closing the valves. The oil pressure in the lifters is there more for a "cushion".
A dry, sunk lifter will still open and close your valves, albeit noisily.
I agree, this needs a condensed version:
https://www.ford-trucks.com/forums/1...am-how-to.html
A dry, sunk lifter will still open and close your valves, albeit noisily.
I agree, this needs a condensed version:
https://www.ford-trucks.com/forums/1...am-how-to.html
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
Really? A quarter of an inch? Is that off the base circle, a quarter of an inch travel? And a decent, mild aftermarket cam is about .450", almost twice the lift?
What duration is oem?
What duration is oem?
Tuned
Joined: Nov 2007
Posts: 386
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From: Whitmore lake Mi
I think the info is here...
https://fordsix.com/forum/viewtopic.php?f=2&t=58096
If you can read it.
HTH
Jim
https://fordsix.com/forum/viewtopic.php?f=2&t=58096
If you can read it.
HTH
Jim
Postmaster
Joined: Mar 2005
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From: Earth
IIRC the stock cam duration is ~268 degrees but it's ground something like 10 degrees retarded.
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