Duramax Diesels Forum Truck of the Week
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Old 11-21-2009, 11:14 AM
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Default Harbor Freight compression tester

I bought the compression tester for diesel engines from harbor freight."item#93644"Found the correct adapter for the glow plug hole but it does not seem to go all the way inwithout the hex hitting on the head.Is there a to make it seal without going all the way in.Maybe wrap the thread with some tfe tape?
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Old 11-21-2009, 12:01 PM
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Just tried teflon tape and it seemed to help some.Does not seem to hold the pressure.Goes upward to 375 then drops.
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Waiting on a transplant
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Old 11-21-2009, 12:10 PM
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Mine bottoms out at the hex and seals tight. You might have a bad adapter.
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Old 11-21-2009, 12:24 PM
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i put some grease on the adapter so it could slide all the way on
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Old 11-21-2009, 12:38 PM
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It went in about 6-8 threads then the conner of the hex hits.I was able to wrap the threads with some teflone tape and that seemed to help some.Seen around 375psi but have a mist of fuel coming out of #7 glow plug hole when turning it over.
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Everett. KCCO
07 lbz,ccsb,4wd
EED,TTS ,Danville,PPE,RDL,
Calvins,BT,F1,& Driveway
11.08@127.86mph

02 lb7,sclb,4wd
Waiting on a transplant
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Old 11-21-2009, 01:09 PM
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Quote:
Originally Posted by emiller3 View Post
It went in about 6-8 threads then the conner of the hex hits.I was able to wrap the threads with some teflone tape and that seemed to help some.Seen around 375psi but have a mist of fuel coming out of #7 glow plug hole when turning it over.
Do you have the fuel shut off? If so sounds like a bad injector.
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2010 Straight Diesel 2.8 Points Champion
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Old 11-21-2009, 01:21 PM
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all of the injectors are unpluged.
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Everett. KCCO
07 lbz,ccsb,4wd
EED,TTS ,Danville,PPE,RDL,
Calvins,BT,F1,& Driveway
11.08@127.86mph

02 lb7,sclb,4wd
Waiting on a transplant
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Old 11-21-2009, 01:22 PM
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Quote:
Originally Posted by emiller3 View Post
all of the injectors are unpluged.
Sounds like you have a cracked nozzle or a scared needle seat.
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Old 11-21-2009, 01:29 PM
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That sucks for sure.Where is the best place to buy one injector.
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Everett. KCCO
07 lbz,ccsb,4wd
EED,TTS ,Danville,PPE,RDL,
Calvins,BT,F1,& Driveway
11.08@127.86mph

02 lb7,sclb,4wd
Waiting on a transplant
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Old 11-21-2009, 01:36 PM
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Quote:
Originally Posted by emiller3 View Post
That sucks for sure.Where is the best place to buy one injector.
Try to find a low mileage used one or get one from Pensacola Diesel. That is where I get mine from.
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Travis
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06 2500hd ECLB 6.0 gasser

2010 Straight Diesel 2.8 Points Champion
special thanks:
B&B Pulling and Greene's Diesel Performance, Fully Spooled Motorsports, Johnboy, Simon, Ed, ProFab Performance, Hamilton Cams, Extreme Prejudice Racing, Ridge Runner Diesel
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Old 11-21-2009, 02:03 PM
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thanks for the info i will try calling them on monday, to bad they are not open today
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Everett. KCCO
07 lbz,ccsb,4wd
EED,TTS ,Danville,PPE,RDL,
Calvins,BT,F1,& Driveway
11.08@127.86mph

02 lb7,sclb,4wd
Waiting on a transplant
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Old 11-23-2009, 11:20 AM
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I have this same compression tester and the adapter doesn't properly screw into LMM heads either......Are LBZ and LMM heads the same casting?
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Old 11-23-2009, 12:06 PM
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I believe LBZ and LMM are the same. I took a glowplug to a machine shop and had them make me an adapter.
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