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Thread: How to check/replace timing chain - time to get truck running again

  1. #1
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    Default How to check/replace timing chain - time to get truck running again

    Been awhile since I've been on here. Had trouble with my truck in April of 2009, and haven't been able to drive it since. See this earlier thread if you want background:

    http://www.thetruckstop.us/forum/showthread.php?t=10347

    Anyway, now that it is warmer and I have more time on my hands, I want to get it running again. It's been suggested my timing chain may have jumped a tooth or two or has stretched. I have never checked/replaced a timing chain nor seen it done. I've searched on here to see if someone has done a writeup, but couldn't find anything. I have the Haynes manual for the truck, but it only shows gassers.

    So if someone could post a step by step on how to check the timing chain and also, if it needs replacement, how to replace, I would be grateful. If you could let me know what parts need to replaced (whether just checking or replacing) such as gaskets, etc. and if bolts can be reused or if I need to use new ones. Also, if there are other parts that would be wise to replace during a timing chain swap, I'd like to know that too.

    Thanks. I miss my truck. Looks pretty sitting in the driveway, but I miss the sound and driving it.
    Gordy

    1995 Chevy Silverado 2500 6.5TD
    4" exhaust
    Heath PMD relocator
    snorkel & air box cone removed
    OPS extension hose
    OPS bypass relay

  2. #2
    Registered User ak diesel driver's Avatar
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    Pretty hard to check timing chain without physically looking at it. Did you ever get your CPS fixed?
    96 gmc k2500 4" exhaust, marine inj, #9 resistor, GL4, turbomaster, duraterms,-1.94 TDCO,FTB, remote pmd, isspro pillar gauges, kennedy opsu relay kit,141 block, 2 1000 w block heaters, 2 150w glue on oilpan heaters, 2 150w glue on transpan heaters, 97 K47 air filter , IP replaced at 229k ,gear drive set awaiting install, Parts for intercooler waiting to be installed

    94 k1500 excab sb 6.5 plow truck. Fisher plow w/engine driven pump, F intake, h/m turbomaster, plowing chip by Buddy, remote PMD w#9 resistor, Duraterms

    96 k3500 CC 6.5 dually
    94 k2500 excab lb 6.5 parts truck
    00 burb 5.3 wifes
    70 Ford reg cab lb 428 cj richmond 5spd lockers 35s
    75 Vette built 383 needs work
    62 Tempest convertible way on the back burner project
    85 Honda VF1000R
    90 P30 Cummins BT4 work van
    90 Int SA dump w/trailer
    416c backhoe

  3. #3
    Registered User buddy's Avatar
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    You can learn from some others that realized they could install the CPS backwards because the mounting tab came off. Replacing it with a new one would be a good idea, as it likely to cause the timing issues you were having.
    94 6.5TD C1500 ECLB w/ 50 gallon aux tank/box; 235/75R17 tires on Alloy wheels; 3.42 gears; A-Team Turbo; 4" Aero Turbine 4040 muffler to 5" Aero Turbine 5050XL muffler to 6" tip before rear axle; FSD heatsink, marine injectors; "F" intake; SynBlend 10W-30 oil; Walbro FRB-5 w/ 12 micron prefilter; Feed The Beast; WMI and Propane fumigation; OPS extension & relay; 110K original miles; Engh GMTDScanTech
    Near Future: Battery relocation, Amsoil Nanofilter behind headlight, and stereo upgrades
    Veterans of America Club, member #18

  4. #4
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    I did replace the CPS with a new one. That was prior to the last Scantech readings.
    Gordy

    1995 Chevy Silverado 2500 6.5TD
    4" exhaust
    Heath PMD relocator
    snorkel & air box cone removed
    OPS extension hose
    OPS bypass relay

  5. #5
    Registered User Big T's Avatar
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    Rotatable CPS, I resemble that.

    I talked with Bill Heath and he said they leave the timing chains in for 250K miles. Factory specs allow for up to 5/8" deflection. I replaced mine while doing the Heath cooling upgrade and it had 1/2" deflection at 155K miles. As noted, my impossible timing issues were due to the mounting bracket separating from the CPS. If you're in there, replace the CPS. They're like $50 at RockAuto. The plastic on the CPS softens up over time.

    As to the step-by-step, you need to pull the water pump and then the timing cover housing to be able to check the timing chain deflection. I skimmed your prior thread and I really doubt it's a timing chain issue. It's more likely the CPS or the Optical Filter Harness.
    1999 Chevy Suburban K2500 4x4 w/ 6.5TD 190K miles. 4L80E and 3.73 rear gears. HD lift pump, ATT, Heath HO injectors, 4" Diamond Eye Turbo Back exhaust, Warpspeed x-over, deleted soot trap , D-Tech pmd behind bumper, Heath programming for ATT, Pillar mounted gauges: EGT, Boost, Tranny Temp. Replaced IP at 130K. HID light conversion with All-4-On-Hi. Forged Alcoa wheels.

    My son's 1994 GMC Suburban K2500 4x4 w/ 6.5TD 243K miles. 4L80E and 4.10 rear gears. Buddy 4 position tune. Rebuilt Bosch injectors and new Duraterm glows. HO water pump with Dmax fan, HD fan clutch and new AC Delco 195 T-stats. Diamond Eye 3" Downpipe and 4" exhaust, deleted soot trap. Warp speed 2.5" mandrel bent crossover. D-Tech PMD mounted behind the bumper. Pillar mounted gauges: EGT, Boost, Tranny Temp. Rancho 9000 shocks. Rebuilt front end and steering box tightened. Forged Alcoa wheels.

  6. #6
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    I did take the Optical Filter Harness out of the loop last year with no difference.
    Gordy

    1995 Chevy Silverado 2500 6.5TD
    4" exhaust
    Heath PMD relocator
    snorkel & air box cone removed
    OPS extension hose
    OPS bypass relay

  7. #7
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    Ok guys dont laugh to loud, what is a cps? Also I have installed a Heath boost kit and it raddles like hell. My 95 c3500 has 160000 miles and runs a little hot when pulling my horse trailer so I thought I would install one of Heaths cooling kits and fan since my truck only has a 5 blade fan.Any thoughts on this are appreciated. George Reed Valparaiso in. Also am planning a timing chain change at the same time.Whats a good brand chain to use?

  8. #8
    robzombie4551 robzombie4551's Avatar
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    Ok guys dont laugh to loud, what is a cps?

    [C]hicks [P]umping [S]traight guys.

    Okay, really crank/cam position sensor.

  9. #9
    Just a farm kid... tanman_2006's Avatar
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    Quote Originally Posted by Big T View Post
    I talked with Bill Heath and he said they leave the timing chains in for 250K miles. Factory specs allow for up to 5/8" deflection.
    If he heard mine with ~150K on it I doubt he would keep driving it. Mine rattles like a kids bicycle.
    Tanner

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  10. #10
    Wild Blonde from Cloud Mt Missy Good Wench's Avatar
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    I seriously doubt that the chain has jumped.

    The timing sprockets wear very very little, though the chain can stretch a tad the ECM will adjust things as this happens.

    Grab the crank pulley or use a break bar with a socket on it and see iof you can rock the crank gently back and forth.

    The first tiny bit of movement either way will be the slop in the chain.

    The pistons dont take much to turn, but the valve train takes a fair amount to move.

    I ahve seen these engines with 250K on them and the chain was still within reasonable limits.

    Not in the best condition but still runnable.

    Missy
    1995 GMC 3500 4x4 Crewcab DaHooooley
    6.5 Turbo diesel
    Banks exhaust
    Heath Turbo master and Heath Chip
    Custom Interior and paint by ??????????

    89 K5 Blazer 4x4 5.7 Gasser
    84 K5 Blazer 4x4 6.2 Diesel

  11. #11
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    Quote Originally Posted by 1hot57 View Post
    Also am planning a timing chain change at the same time.Whats a good brand chain to use?
    I have no direct experience, but bk95td has on several occasions reccommended Cloyes brand to others.

    Don
    1983 Chev 1/2 ton 6.2 N/A, mileage unknown but obviously high, my "training wheels" for diesel, planned use was to make a trailer and possible heart transplant for my 1971 FJ40 Landcruiser

    1994 Chev K2500 4X4 6.5TD, extra cab, long bed, Turbomaster and snorkle removal by P.O. to my P.O., PMD relocated, LP relay mod and at same time added push button for fuel filter priming, 2.5" crossover, Diamond Eye 3" downpipe and 4" exhaust, all on headlights mod, boost fooler, gauges (EGT, boost, fuel pressure, H2O temp, tranny temp), homegrown version of Feed The Beast, TCC lockup mod, 9 blade DMax fan, HO balanced flow water pump, Heath's low temp fan clutch

  12. #12
    Registered User ak diesel driver's Avatar
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    mostly because of the amount of chain slop in the others
    96 gmc k2500 4" exhaust, marine inj, #9 resistor, GL4, turbomaster, duraterms,-1.94 TDCO,FTB, remote pmd, isspro pillar gauges, kennedy opsu relay kit,141 block, 2 1000 w block heaters, 2 150w glue on oilpan heaters, 2 150w glue on transpan heaters, 97 K47 air filter , IP replaced at 229k ,gear drive set awaiting install, Parts for intercooler waiting to be installed

    94 k1500 excab sb 6.5 plow truck. Fisher plow w/engine driven pump, F intake, h/m turbomaster, plowing chip by Buddy, remote PMD w#9 resistor, Duraterms

    96 k3500 CC 6.5 dually
    94 k2500 excab lb 6.5 parts truck
    00 burb 5.3 wifes
    70 Ford reg cab lb 428 cj richmond 5spd lockers 35s
    75 Vette built 383 needs work
    62 Tempest convertible way on the back burner project
    85 Honda VF1000R
    90 P30 Cummins BT4 work van
    90 Int SA dump w/trailer
    416c backhoe

  13. #13
    Wild Blonde from Cloud Mt Missy Good Wench's Avatar
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    I went back and scanned though the first thread on this issue.

    IMHO the IP is shot.

    The swapping of ECM's and such was a good tool to use in diagnostics, but now I think you are up against the wall on this thing.

    The codes and dieing issue seems to follow along.

    If you can get ahold of a KNOWN good IP, swap the sucker out and give it a go.

    My bet is that a fresh 5521 pump will fix the things issues.

    If you can borrow a known good IP and use to test it, this would be great and not have to spring for the new one up front.

    I do not believe the issue is the timing chain, not even.

    The Pulse width error code and the intermitent ballance codes ternd to indicate that the IP has issues.

    Keep us posted
    1995 GMC 3500 4x4 Crewcab DaHooooley
    6.5 Turbo diesel
    Banks exhaust
    Heath Turbo master and Heath Chip
    Custom Interior and paint by ??????????

    89 K5 Blazer 4x4 5.7 Gasser
    84 K5 Blazer 4x4 6.2 Diesel

  14. #14
    Registered User Tookie's Avatar
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    If the timing had jumped, it wouldn't start and run sometimes
    Tookie LeBlanc
    Current DD: 2012 VW Jetta TDI

    Newest truck: (11/2011 - 3/2013, Sold!)
    2009 Toyota Tacoma, TRD sport 4X4 crewcab

    Newer truck: (2010 - 2011, sold!!)
    2004 Chevy 2500HD, LB7, Hypertech III, K&N cold air, Cooper Discoverer HTs, Rhino liner...

    Old truck: (2003 - 2010)
    1997 GMC Sierra 2500 X/C longbed, 6.5 / 4L80E 230,000+miles, original IP,
    3rd PMD, Kooler, (now behind bumper) new shocks, evaporator core, heater core,
    ball joints, batteries, crankcase depression regulator, deleted vac pump and home made TM,
    new brake cylinders & calipers, ceramic pads, new starter, batteries..........
    and a dozen other things I am sure I forgot

  15. #15
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    I'm back :-)

    I've been swamped at work for the last 18 months - many weeks working 80-90 hours and some days putting in as many as 20 hours. And all on salary

    Anyway, this work project is coming to an end so I'm getting some free time plus my oldest turned 16 so I need another vehicle.

    I shot an email to Bill Heath a few days and he had me call him. Just got off the phone with him. He suggested I go back over all the grounds, but he also mentioned it is important to make sure they are all terminated on the intake manifold. I had checked/cleaned grounds previously, but didn't pay attention to where they were attached. I just reattached them to where I found them. They could have been moved from the factory locations by previous owners/shops.

    So that is my next step. I won't be able to get to it until next weekend I think, but I'll report back when I'm done.
    Gordy

    1995 Chevy Silverado 2500 6.5TD
    4" exhaust
    Heath PMD relocator
    snorkel & air box cone removed
    OPS extension hose
    OPS bypass relay

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