zz502 collapsed lifter?? - Chevelle Tech
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post #1 of 76 (permalink) Old Jun 16th, 19, 9:08 PM Thread Starter
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Frank
 
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zz502 collapsed lifter??

Hi guys been awhile since I posted here. So ill just get right to it.

So end of last year i topped off the tank w some gas/stabil added and drove around for about a half hour to make sure the stabil and gas made it way into carb, Got her home and pulled her up on my 4 post rack. Let her cool down covered her and hoisted her up in the air for hibernation. Oh and pulled the batt and put it on bench w tender on. No issues nothing.

So i finally got around to firing her up this year. Put batt in and turned the key. Fired up second try...but the joy was quickly wiped off my face with horror! I could not believe the noise and rough idle. I quickly shut it down. Started it again and same thing.

So my buddy came over yesterday and he thinks its a collapsed lifter. Makes sense because it sounded like it was way outta time. With a very shaky idle. Oil pressure popped up to almost 60 everything else was fine.

So first off how common is this? All it did was sit for the winter. Keep in mind this car and engine was put together in 2014. Thats 9 yrs. Have you ever heard of a lifter collapsing by just sitting over the winter?

Crazey Davey helped me put this together. Is he still around?? Its a Lunati cam, Comp gold roller rockers, stock push rods and stock roller lifters. Stock valves shimmed to about 142lbs. Davey said everything would be fine. So after bugs worked out he was right and I never had a problem with the engine till now. So im a little freaked out.

Should I just swap out the lifter and be done? or would you guys get rid of these stock 502 lifters?

Thnx and Happy Fathers day to all the Dads here!!
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post #2 of 76 (permalink) Old Jun 16th, 19, 10:21 PM
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Eric
 
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Re: zz502 collapsed lifter??

Sometimes lifters bleed down after sitting for a while and need a bit of run time to pump back up. Or... you may have gotten some dirt in one and it won't pump up.

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post #3 of 76 (permalink) Old Jun 16th, 19, 11:50 PM
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Re: zz502 collapsed lifter??

or you got a vacuum leak due to a hose that gave up over the winter. check all the hoses including the PB and PCV by running your fingers along looking for a collapsed or split hose. The weirder the deal seems to be the more important it is to start with the basics.

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post #4 of 76 (permalink) Old Jun 17th, 19, 3:08 AM
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Sitting for a long period, never just start the engine up.
Disconnect the distributor so there is no spark. Crank the engine intermittently about 5 seconds at a time, until the oil pressure maxes out while it’s cranking. Now crank for 5 seconds intervals about another 10 times.
Then connect the distributor and start it.
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post #5 of 76 (permalink) Old Jun 17th, 19, 1:16 PM Thread Starter
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Re: zz502 collapsed lifter??

Thnx Kerry and in reality your 100% correct. However and im not trying to get in any kinda of debate on this. But I have never done that on any car ive ever had unless it was a first time start or it sat for YEARS. Ive never had a problem up until now and even by doing what you say I dont think it would have made a difference. Yes its not really the right thing to do but like I said ive always done it. With todays synthetics adhering to everything It should be fine. Heck they drained the oil out of engines with synthetic and ran them with no oil. But yes your right it should be done.

10 year Frame-off finally done...oh wait are they ever done??
ZZ502
Lunati cam, Pro-Sytems 1000HP carb
TKO600

Link to some early restoration

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post #6 of 76 (permalink) Old Jun 17th, 19, 1:18 PM Thread Starter
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Re: zz502 collapsed lifter??

Quote:
Originally Posted by Tom Mobley View Post
or you got a vacuum leak due to a hose that gave up over the winter. check all the hoses including the PB and PCV by running your fingers along looking for a collapsed or split hose. The weirder the deal seems to be the more important it is to start with the basics.
Would a bad vac line really make it sound out of time with an extremely rough idle? I know ive heard them suck air with a lil rough idle but not making the noise this thing is.

10 year Frame-off finally done...oh wait are they ever done??
ZZ502
Lunati cam, Pro-Sytems 1000HP carb
TKO600

Link to some early restoration

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post #7 of 76 (permalink) Old Jun 17th, 19, 1:19 PM Thread Starter
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Re: zz502 collapsed lifter??

Thnx for the tips, im going to try and break it down today or tmr. So ill let ya guys know.

By the way noone said is Crazey Davey still around?

10 year Frame-off finally done...oh wait are they ever done??
ZZ502
Lunati cam, Pro-Sytems 1000HP carb
TKO600

Link to some early restoration

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post #8 of 76 (permalink) Old Jun 17th, 19, 1:23 PM
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Re: zz502 collapsed lifter??

Vacuum leak, spider eggs in an air bleed, stuck advance weights, bad gas. Usually these things self correct after running for a little bet, well except the bad gas.
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post #9 of 76 (permalink) Old Jun 17th, 19, 1:50 PM
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Re: zz502 collapsed lifter??

Frank,
How long did you let it run ?? I had a hydraulic lifter in my Heavy Chevy back years ago that would do the same thing every once in a while whether the car sat or not. I would shut it off and let it sit a half hour and it would be fine. I would try running it a few minutes and see what happens.

This is going to sound crude but I would pull the valve covers and see if you can tell which one is stuck. Turn the engine over by hand so that valve is definitely shut and just let it sit a while. Maybe even tap on the pushrod end of the rocker with a small hammer and see what happens. It might pop loose and be good to go.

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post #10 of 76 (permalink) Old Jun 17th, 19, 1:54 PM
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Re: zz502 collapsed lifter??

This is what i always do if my engine sits for a long period.I take the distributor out and prime the engine with my oil pump tool.Rotate 180 and prime again.No other method is as good period.I prime the carb and start vehicle ,prime again until it gets its own fuel.Never run an engine on low oil pressure which is what you have when just cranking.How fast you get the oil pressure to the cam and bearings is what makes or breaks over time.

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post #11 of 76 (permalink) Old Jun 17th, 19, 2:04 PM
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Re: zz502 collapsed lifter??

Quote:
Originally Posted by nutt View Post

By the way noone said is Crazey Davey still around?
He passed away last year


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post #12 of 76 (permalink) Old Jun 17th, 19, 2:17 PM
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Re: zz502 collapsed lifter??

2014 was five years ago, not nine.

You've got some diagnosis to go through and a number of things to eliminate before you can somehow assume it's a lifter, IMHO.

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post #13 of 76 (permalink) Old Jun 17th, 19, 10:14 PM
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Re: zz502 collapsed lifter??

If this is a hydraulic roller, it's a common problem with irrigation engines. Farmers shut 'em off warm and left them to sit all winter. When they fired them back up, the oil was gooey in the lifter. Sometimes the same condition happened in the roller and the lifter would skip on the cam, eventually taking it out.

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post #14 of 76 (permalink) Old Jun 18th, 19, 2:19 AM
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Re: zz502 collapsed lifter??

my 2000 winnebago has a 454,and last spring when i got it out it was clattering something fierce.but ran o.k. thought it was low on oil so checked it and it was a little high,so figured should change it anyway so went to pull plug and before it came out i got a little anti freeze,thought great what now.so pulled intake and i had 4 lifters that came apart,so ended up replacing all the lifters and the 4 pushrods.she's smooth as silk now.
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post #15 of 76 (permalink) Old Jun 18th, 19, 4:24 AM
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Re: zz502 collapsed lifter??

Another thought, run a quart of trans fluid in the oil until it is warm, drive it around the block and then change your oil. May have junk in there that needs cleaned out.. transmission fluid does a great job at cleaning.
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