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Old 07-21-2018, 01:07 PM   #1 (permalink)
spwjph
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Lifter failure ?

So, a couple months ago I was driving from North of Seattle Washington about 3hrs to Portland OR to pickup a 2door Tahoe at a buddy's house that I had purchased. About half way down to Portland while in stop and go traffic my flatbad started making a knocking noise. The noise was loud at first then quited down some. Made the trip Tahoe in toe back home. The noise went away for the majority of the trip back, started back up again about 20 miles from home. I swapped some injectors out with the problem still persisting. Came to the conclusion that it must be valve train noise. Pinpointed the suspected cylinder #4, removed that valve cover and rocker assembly and lifter. Here is what I found.

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95 burb L65 F,320K miles,original engine,DE exhaust,flo-proXover,homebrew FTB,HX40II 14cm turbone,Buddy's six banger, 311 HO injectors/5521ip, 3.42 RP, Gray PMD, Bosch Duraterms, 265/75/16 Cooper ST Maxx

95 C3500HD flatbed, Navistar block @ 100K, Flo-ProXover, FTB, Buddy 6 banger tune, 311 HO Injectors/5521ip, 4.63 RP,225/70/19.5....in process,HX40 18cm W/4" DP-5"back exhaust, Fass150 LP got all the stuff just need to "getter done"


Both have GMT800 cooling system upgrades...single stat, 9 blade composite fan, Hayden HD fan clutches...
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Old 07-21-2018, 01:18 PM   #2 (permalink)
jnlperformance
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Ewww, that sucks.

Looks like your barking up the right tree though... maybe a collapsed lifter or bad/failed guide?

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Last edited by jnlperformance; 07-21-2018 at 01:19 PM.
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Old 07-21-2018, 08:31 PM   #3 (permalink)
bk95td
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Looks more like lack of lubrication to me. I'd be checking the cam for tracks worn in from the rollers on the lifters. Lifters can be removed without pulling the heads.
I bought a truck with "blown head gasket" that had been driven to several shops for quotes in very cold weather. The oil got thicker than grease. The main and rod bearings looked ok for 300K miles, but the top end was starved because the oil was too thick to pump through the smaller passages. All the rocker arms were worn like that and the cam had tracks in it along with spun cam bearings.
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Old 07-21-2018, 11:55 PM   #4 (permalink)
Rambos_Ride
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What's the oil pressure when you're at temp, sitting at idle in drive? And does anyone know what it "Should" be?

I've seen mine go down to 25-30
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Old 07-22-2018, 01:24 AM   #5 (permalink)
spwjph
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Bk95td, I pulled that lifter and disassembled it, found some noticable Ware on the upper end of the bore. My thought was that was where it hung up allowing excessive lash- pushrod to rocker arm length causing the ware on the valve stem tip ? The roller of the lifter looked smooth / and inspection of the cam on that lobe I see no obvious ware or unusual marring or markings. Wondering if I can just file or grind the valve stem smooth ? I believe they are stellite valves? Is that material hardend thru so if I file or grind it the material is the same thru the whole stem? Also was planning on replacing the rocker arms with new or almost new with less noticable ware. Some posts that I read with similar condition there was recommendations of valve lash caps , any thoughts on using them ?
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95 burb L65 F,320K miles,original engine,DE exhaust,flo-proXover,homebrew FTB,HX40II 14cm turbone,Buddy's six banger, 311 HO injectors/5521ip, 3.42 RP, Gray PMD, Bosch Duraterms, 265/75/16 Cooper ST Maxx

95 C3500HD flatbed, Navistar block @ 100K, Flo-ProXover, FTB, Buddy 6 banger tune, 311 HO Injectors/5521ip, 4.63 RP,225/70/19.5....in process,HX40 18cm W/4" DP-5"back exhaust, Fass150 LP got all the stuff just need to "getter done"


Both have GMT800 cooling system upgrades...single stat, 9 blade composite fan, Hayden HD fan clutches...
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Old 07-22-2018, 01:25 AM   #6 (permalink)
spwjph
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I should clarify the ware on the lifter was internal on the piston bore.
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95 burb L65 F,320K miles,original engine,DE exhaust,flo-proXover,homebrew FTB,HX40II 14cm turbone,Buddy's six banger, 311 HO injectors/5521ip, 3.42 RP, Gray PMD, Bosch Duraterms, 265/75/16 Cooper ST Maxx

95 C3500HD flatbed, Navistar block @ 100K, Flo-ProXover, FTB, Buddy 6 banger tune, 311 HO Injectors/5521ip, 4.63 RP,225/70/19.5....in process,HX40 18cm W/4" DP-5"back exhaust, Fass150 LP got all the stuff just need to "getter done"


Both have GMT800 cooling system upgrades...single stat, 9 blade composite fan, Hayden HD fan clutches...
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Old 07-22-2018, 01:44 AM   #7 (permalink)
spwjph
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Rambos ride, on the oil pressure I'm not sure what it should be. What I have seen with my trucks is that the pre-oil squirt blocks seem to have overall higher oil pressure but still at temp idle come down to 30 or so psi. The engines I have with piston cooling spray nozzles seem to exhibit a more variable oil pressure at temperature idle 30+ upper rpm 40-60psi more prominent fluctuations. Not sure if that makes sense and may not be the same with all engines depending on age milage and internal condition.
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95 burb L65 F,320K miles,original engine,DE exhaust,flo-proXover,homebrew FTB,HX40II 14cm turbone,Buddy's six banger, 311 HO injectors/5521ip, 3.42 RP, Gray PMD, Bosch Duraterms, 265/75/16 Cooper ST Maxx

95 C3500HD flatbed, Navistar block @ 100K, Flo-ProXover, FTB, Buddy 6 banger tune, 311 HO Injectors/5521ip, 4.63 RP,225/70/19.5....in process,HX40 18cm W/4" DP-5"back exhaust, Fass150 LP got all the stuff just need to "getter done"


Both have GMT800 cooling system upgrades...single stat, 9 blade composite fan, Hayden HD fan clutches...
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Old 07-22-2018, 01:56 AM   #8 (permalink)
spwjph
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So, my decision to make now is should I get a set of lifters and replace all of them on that side while it's apart and also get new pushrods as well so everything is fresh ? With having to pull the intake and injection lines ect to get to the valve cover, hoping to successfully get this repaired and have this behind me.
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95 burb L65 F,320K miles,original engine,DE exhaust,flo-proXover,homebrew FTB,HX40II 14cm turbone,Buddy's six banger, 311 HO injectors/5521ip, 3.42 RP, Gray PMD, Bosch Duraterms, 265/75/16 Cooper ST Maxx

95 C3500HD flatbed, Navistar block @ 100K, Flo-ProXover, FTB, Buddy 6 banger tune, 311 HO Injectors/5521ip, 4.63 RP,225/70/19.5....in process,HX40 18cm W/4" DP-5"back exhaust, Fass150 LP got all the stuff just need to "getter done"


Both have GMT800 cooling system upgrades...single stat, 9 blade composite fan, Hayden HD fan clutches...
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Old 07-22-2018, 08:56 AM   #9 (permalink)
jnlperformance
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Quote:
Looks more like lack of lubrication to me
Yea I didn't even think of that.

Bk95td is on it lol. Subbed and just seeing how this one plays out. Curious.

Plugged or restricted oil gallery????
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Old 07-22-2018, 11:43 AM   #10 (permalink)
sctrailrider
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You would be better off changing all of the lifters and rockers. It wouldn't hurt to install a new HV/HP oil pump at the same time..



You could use lash caps but you would need to use them on all places.



And push rods, check them all to see if any are bent..

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