Harbor Freight compression tester

[emiller3]

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?

 

[emiller3]

Just tried teflon tape and it seemed to help some.Does not seem to hold the pressure.Goes upward to 375 then drops.

 

[bullfrogjohnson]

Mine bottoms out at the hex and seals tight. You might have a bad adapter.

 

[2500HeavyDuty]

i put some grease on the adapter so it could slide all the way on

 

[emiller3]

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.

 

[bullfrogjohnson]

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.

 

[emiller3]

all of the injectors are unpluged.

 

[bullfrogjohnson]

all of the injectors are unpluged.

Sounds like you have a cracked nozzle or a scared needle seat.

 

[emiller3]

That sucks for sure.Where is the best place to buy one injector.

 

[bullfrogjohnson]

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.

 

[emiller3]

thanks for the info i will try calling them on monday, to bad they are not open today

 

[DuramaxPowered]

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?

 

[JoshH]

I believe LBZ and LMM are the same. I took a glowplug to a machine shop and had them make me an adapter.