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Dished lifter
#2413397
12/05/17 02:08 AM
12/05/17 02:08 AM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
OP
master
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OP
master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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So here's the deal. LA 360. Been sitting for a few years.
Clean out the fuel system. Change plugs. Change oil n filter
Check for spark - no spark. Jump ballast resistor - we have spark.
Fire up engine - have a loud lifter tick from the front left
Shut engine down pull valve cover - exhaust rocker super loose - hyd cam
Figure the exhaust valve was open during dormancy and the lifter is collapsed
pull intake and rocker gear and find the lifter is super dished
So- any idea why it happened ????
Cam lobe looks ok. But I'm hesitant to throw a lifter at it.
I used to care but....... things have changed
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Re: Dished lifter
[Re: NTOLERANCE]
#2413406
12/05/17 02:13 AM
12/05/17 02:13 AM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
OP
master
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OP
master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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Lifter slid right out by hand. Had an extractor handy and didn't need it.
Again cam lobe "looks " ok. Haven't measured it
I used to care but....... things have changed
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Re: Dished lifter
[Re: NTOLERANCE]
#2413483
12/05/17 10:38 AM
12/05/17 10:38 AM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
OP
master
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OP
master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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Going to have to put a lifter in just to be able to move the truck.
Wonder if the valve was stuck ?
I used to care but....... things have changed
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Re: Dished lifter
[Re: NTOLERANCE]
#2413810
12/05/17 08:41 PM
12/05/17 08:41 PM
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Joined: Jan 2007
Posts: 2,212 Minnesota
peabodyracing
top fuel
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top fuel
Joined: Jan 2007
Posts: 2,212
Minnesota
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I've seen a fair number of those on LA engines over the years. In my experience as well it always looked like the cam lobe was ok.
I had never chanced it and always replaced the cam and lifters, figuring another one was probably not far behind. In each case once the cam was out, it was pretty apparent the lobe was starting to go flat, even though it sure didn't look that way viewed through the valley.
It sounds like you were wondering if a valve stuck open would cause this. I don't think so. Chances are the lifter just wore through the hardness and starting cupping. If the valve was stuck closed I'd guess you'd see a bent pushrod. I've had that happen on LA's and even slant sixes that had sat for a long time.
Anymore before I try and turn over one that's been dormant a long time I will pull the valve covers and rap on each valve stem with a fiber mallet just to be safe. Some may say that's asking for trouble too, but I've found a freed up more than one stuck valve that way.
Lead, follow or get the hell out of the way
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