Diesel Compression Tester

[Ken13559]

I've bought a diesel compression tester for car. I've a spare Injector for my Yanmar 2GM20F. I want to fit the Injector to the Compression Tester but not sure how. I remember somehere (possibly) had coupled his Yanmar Injector to the tester. I would like to know how he/one does it. Photos or pictures would be great. Much appreciated.

 

[Rich Stidger]

Can't you get an adapter from the manufacturer of the gauge?

 

[Ken13559]

I bought the gauge from Home Depot (Rancho Cucamonga, CA) mid last year when I was there. Make is U.S.General model 93644. Didn't get around to it till now. Its made for cars.
Would US Gen has adaptor for Yanmar?

 

[Rich Stidger]

I bought a gauge made by US Gauge and distributed by K-D Tools # 2826. I used it on an GM 350 diesel that was in cars between 1978-1985. It threaded into the glow plug port which is a lot easier than removing injectors. I'm not familiar with your engine, but if the gauge you bought has a bunch of adapters included with it, have you tried the glow plug port?

 

[Ted]

The Yanmar 2GM20 does not have glow plugs.

 

[cas206]

I was going to have the boat yard mechanic do that for me with a spare Volvo MD7 injector. But then I changed my mind. I don't know the details but it involved the mechanic cutting the injector casing and than "attaching" (weld?) it to a "regular" pressure gauge fitting. With no glow plug port, this sacrificial injector casing gets bolted in the injector port (after the real injector is removed of course). Try talking with a marine mechanic or at a metal shop if you don't get an answer here.

 

[Ken13559]

I was going to have the boat yard mechanic do that for me with a spare Volvo MD7 injector. But then I changed my mind. I don't know the details but it involved the mechanic cutting the injector casing and than "attaching" (weld?) it to a "regular" pressure gauge fitting. With no glow plug port, this sacrificial injector casing gets bolted in the injector port (after the real injector is removed of course). Try talking with a marine mechanic or at a metal shop if you don't get an answer here.

Yup! that's my thought and I remember someone mentioned he did it this way. I would like to see the photos of how he did it to get better idea.
There are two ports on the 2GM20F Injector. I think I could use either one of these ports. 1 for fuel in and another for overflow back to tank. I suppose I'll have to remove the nozzle/pin assembly entirely, connect to 1 port and cap up the other. Will probably weld a supplied adaptor, for cars, to the Injector body for coupling the gauge.

 

[capta]

I would guess that where you are, it would be a lot cheaper to have a tech come to the boat and check your compression. They might even loan you a tester. Taking apart an injector is a one way deal, unless you have the proper tools (expensive) and are knowledgeable about such things. They are not owner serviceable. A spare injector is not a bad thing to have aboard. I had 3 injectors serviced in Trinidad for less that US$120.00 including new tips, if that might be your problem.

 

[Ken13559]

Capta, I wish diesel techs in Singapore are half as good as those in US. They don't use compression tester nor use torque wrench.

 

[capta]

Capta, I wish diesel techs in Singapore are half as good as those in US. They don't use compression tester nor use torque wrench.

I certainly have no first hand knowledge of techs in Singapore, but with all the commercial vessels that you get there, I'd be absolutely amazed that there aren't at least several good shops. In places where there weren't, I've always had great luck making friends with the engineers aboard commercial vessels or large motor yachts, when I needed help. Last time, in Bermuda, the chief engineer of a 250' motor yacht and I rebuilt my injection pump, on his work bench, saving me many hundreds of dollars for a replacement. I've done similar things on cargo and military (the British are the most friendly; not so much US) ships around the world. And as a byproduct, we've usually been invited for meals and a few pints at the pub (again, British military ships). Go make some new friends.