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#1 |
Registered User
Join Date: Aug 2007
Location: orlando
Posts: 456
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Lifter problem
I just overhauled my 402 including new hyd. lifters. I guess I may not have broken it in properly or didn't use enough assy. lube; but I cupped out my #1 exhaust lifter. Well I'm also having a problem with that particular lifter, and the #5 exhaust NOT pumping oil. ALL the others are pumping fine. I've R/R both lifters w/new units. Adjusted all the valves again, and still no oil on those two individual rockers. ALL the rockers are moving 1/4" up & down. So they're operating fine. Is it possible for 2 lifter galleries to get clogged at the same time? I don't know what else it could be. If they may be clogged, can I shoot air back through my oil pressure gauge fitting (on the block) to clear them? Any other suggestions before I pull the intake ONE MORE TIME!? Thanks all................
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#2 |
Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: Lifter problem
John- tell me what you are doing when you do not see oil.
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#3 |
Registered User
Join Date: Aug 2007
Location: orlando
Posts: 456
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Re: Lifter problem
OK...I'll try and be brief. I initially discovered this shortly after starting the engine after overhaul, & driving it. A lifter tick turned into a clack, then turned into a clatter. I pulled the covers & found the #1 exhaust, & #5 intake were pumping no oil to the rockers. Pulled the intake & lifters and found the #1 cupped about 3/16"; the #5 lifter looked fine. NAPA replaced the lifters. Put everything back together, readjusted all valves, and started her up. Same problem with the same two lifters. ALL other rockers pumping normally, all 16 rockers are moving about a 1/4". My oil pressure dash guage reads high while driving (when I had it on the road), and just under high @ idle. I figure that's normal. My uneducated guess is that there's some kind of blockage in the lifter bore galleries of those two lifters. Could that be possible? If so, is there a way to clear it w/o disassembling the entire engine again? Thank you sir, for any advice you offer............John
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#4 |
Registered User
Join Date: Nov 2007
Location: Chamberlain, SD
Posts: 183
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Re: Lifter problem
How does the cam-lobe on the affected lifter look ?? My first instinct is the old 'EPA-mandated oils'... Oils the last decade have less and less High-Pressure additives (phosphorous, zinc) and more cams than ever fail right after greak-in)...
Just a thought, hope you get to the bottom of it... |
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#5 |
Registered User
Join Date: Apr 2002
Location: New Carlisle, Ohio,USA
Posts: 1,404
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When I rebuilt my 350, I spun the oil pump until I got oil to all the lifters and rocker arms. I did this with an old distributor I had cut down and the gear removed. Took awhile, but I had oil to all lifters before even starting it. I then proceeded to go through the breakin. Did you by chance do this?
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#6 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,232
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Re: Lifter problem
In the early 70's the big blocks had some oiling problems on a couple of lifters. #1 cylinder. I went through this with my dad's wrecker. It's been a long time but it seems there was a TSB issued to fix calling for the front oil galley plug to be drilled out on that side. It seems the oil couldn't drain past that lifter quick enough and got too hot then the lifter failed causing the clack. After replacing those two lifters twice we were told of this fix. We drilled the hole and no probs since. I have long forgotten the size hole we drilled but it wasn't much.
You may have installed a high pressure oil pump hence the high pressure reading? Maybe some old GM mechanics will remember the oiling problem I speak of.
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#7 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: Lifter problem
If you have cupped a lifter you have trashed the cam. Make sure the push rods are cleared out. There has been an influx of cheap chinese lifters that are going bad.
Buy a good lifter like melling or comp cams. Most all newly installed cams that go bad are trashed at install before it even runs on the first several truns by hand. They get scratched and scuffed at start up making the cam a grinder against the lifter. The drilling of the oil galley plugs was a qiuck fix but the lifters were redesigned in the oil recess area. If your new lifters don't match exactly like the old ones I'd bet that they are a generic chinese lifter and not neccessarily for your application. Check your lifter bore clearence. It may be to lose to pass oil up the rod to the rocker Last edited by dwcsr; 10-01-2009 at 01:23 PM. |
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#8 |
Registered User
Join Date: Aug 2007
Location: orlando
Posts: 456
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Re: Lifter problem
WOW! I gotta say all this is a bit overwhelming. I was thinking maybe just a plugged gallery. I have since found out that the passage leads from one lifter to the next. Consequently, if #5 isn't getting oil due to a plugged passage, then #3, along w/ #1 wouldn't get oil. But all others are just fine. All rockers travel just about the same distance. The block was boiled, then blown out w/air to clear all passages. Yes, I did use an old dist. shaft to spin that pump at assy. As I said, this may be too much for my limited knowledge. I'm going to have to try and find an old timer who knows a lot more than me. Right now I'm at a loss, and just standing and staring at the engine. Although I will say, that I appreciate all the advice.
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