SSDieselSupply.com
SSDPro-Exhaust.com
Page 6 of 7 FirstFirst ... 4567 LastLast
Results 51 to 60 of 62

Thread: Troubleshooting Lift Pump

  1. #51
    Join Date
    Feb 2007
    Posts
    2,926

    Default

    Did you keep an old lifter? A wild guess from me is that you could have 10 thou oversize original lifters, and new loose ones are letting the oil in all of the time and over inflating them. Do you have a micrometer? I saved my old ones and can give you the measurement of a standard one.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  2. #52
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

    Default

    I kept one lifter and I have a mic (but its in inches) what measurement are we looking at?
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  3. #53
    Join Date
    Feb 2007
    Posts
    2,926

    Default

    The standard used ones I have are 0.922 inches
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  4. #54
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

    Default

    I’m looking at .923 and I didn’t see anything funky when I put the new ones in. I have to admit I didn’t even think to look if they were different sizes. If mine are standard is there an undersized?
    Last edited by CAdiesel; 08-13-2020 at 11:12 PM.
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  5. #55
    Join Date
    Feb 2007
    Posts
    2,926

    Default

    OK good, one more possibility eliminated. The only other test I can think of, is to push the "closed valve"open, it is possible by hand, and have someone put something between the rocker and push rod, in an attempt to force the oil out of the lifter, then wait a while and remove the spacer, to see if there is then clearance. People on diesel place talk about lifters bottoming out, but that is because of planing the heads and decking the block. I can't see that being your problem.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  6. #56
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

    Default

    Ill give it a shot. One more thing, I cranked the motor over for about 25-30 seconds, without the valve covers on. By the time I had pressure at the gauge I only had oil coming out one rocker, the exhaust for cylinder 1. You had mentioned in one of your earlier posts (not this thread) that you had some issue with the bypass on your oil filter. Is that possibly at play here?
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  7. #57
    Join Date
    Feb 2007
    Posts
    2,926

    Default

    How long did it take to get pressure? The filter problem I had, caused oil pressure delay, the same as after an oil change, about 10 seconds, which would be equal to 30 seconds cranking. I don't think that is the problem, because your lifters are not releasing oil pressure. It seems strange, did you work on 1960s 6 cylinder Chevs with hydraulic lifters and adjustable rockers? With the engine running, you loosen the rocker until it clatters, then slowly screw it down one turn. The lifter adjusted in about 5 seconds. You may have to remove a lifter, and check it's length against the old one, incase you were sent the wrong parts.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  8. #58
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

    Default

    Never worked on ‘60s Chev, that sounds like a messy job, yikes! I think you’re right with pulling a lifter. I’m going to wait until it cools off a bit we’re pushing 110. I’ll let you know what I find out.
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  9. #59
    Join Date
    Mar 2009
    Location
    Folsom, CA
    Posts
    194

    Default

    I have finally gotten around to pulling one head (drivers side) and all the lifters. (I’ll do the other one later.) I was only able to compress two slightly by hand. The other 8 were rock solid. When I spot checked a couple of the lifters originally, they were rock solid. Having never done lifters before I assumed this was how they are supposed to be. I’m learning now that that isn’t necessarily the case. I took apart and cleaned all 8 lifters, reassembled and primed in ATF. I can currently compress them by hand. So it seems that either I didn’t get all the air out or this is how they are supposed to be. I get conflicting information online as to pre-prime or not. It seems to me that if I prime them and I can still compress the motor should do the rest.
    Do you think I’ll be Okay just putting them in the motor with ATF on them or should I clean them and reprime with motor oil? Or should I start over with new lifters?
    I compared them, visually, to the one I saved and they seem identical or do I really need to measure them with a micrometer? Am I missing anything else. I’m hoping to get this put back together soon and I’d really like to not have to do this again.

    One other thing, you said you pre-primed your lifters with a syringe... could you still compress them afterwards?
    Mike
    1994 K2500 Suburban 316,000 mi., F VIN, 4L80E, 3.73 w/posi., 3" turbo back, no cat, FSD Heat Sync, #9 resistor, SSD heads, SSD intake, fuel miser injectors, Bastard IP (5068), 4x4 posi, Cooling upgrade w/duel 180° t-stats and d-max fan

  10. #60
    Join Date
    Feb 2007
    Posts
    2,926

    Default

    After priming, I didn't try to compress them, but did compress a used one, that had oil in it, to take it apart. Any indication of the reason they were stuck, when you took them apart? Without finding the cause, you don't know if it will happen again. I'm not sure about the ATF, it is a lubricant, but low viscosity, when the engine starts, the ATF will be replaced by engine oil. Eyeball comparison for length is adequate, they can adjust quite a lot. I changed mine with the heads on, you need to make 2 tools, the photos were on the site, but I can't find them. I can take a photo of them again, they are a small speaker magnet on a piece of wire, and a clip made from a piece of electrician's steel "fish tape".
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •