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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Bad injectors?

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135 Fan

03-06-2008 17:07:03




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I was looking at a machine with a 115 HP Mitsubishi diesel. It is a low hour engine (2800 hr.). They said I could get the machine cheaper because it smokes and doesn't rev up enough. It runs good at idle. They don't do repairs but think it's just a bad injector or two. They think injectors are around $500 a piece. Does this sound right? It's a 4 cylinder and they'll knock $7000 off the price because of the smoking and missing above idle. Any thoughts? Thanks. Dave

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Kyle Fenstermaker

03-11-2008 07:04:16




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 Re: Bad injectors? in reply to 135 Fan, 03-06-2008 17:07:03  
Check the return line back to the tank. There is a blockage somewhere from injection pump to the tank causing too much back pressure on the injection pump. That will cause the smoking and lack of RPMs. Usually its the check valve in the injection pump going back to the tank. One way to see is remove the fitting from the injection pump and start it up, kind of hold your hand over the threaded hole so you don't get sprayed in the face. The smoking should stop and it should have a better throttle response-if so your problem is from the check valve to the tank blockage.

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JML755

03-11-2008 06:13:45




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 Re: Bad injectors? in reply to 135 Fan, 03-06-2008 17:07:03  
135 Fan,

sounds fishy. I had injectors rebuilt for less than $50 each on my Ford 755 TLB. $500 sounds like dealer prices for NEW. Plus, if they're willing to knock $7k off when they say repairs are around $2k, I'd suspect they know something you don't about this machine and they want to dump it fast.
I'd check the air intake passages (nests) and filters. If it smokes, sounds like it's got fuel. Had similar problem on my TLB and it was the air filters. (Ran fine at idle, but no power and would not rev up) Is it a turbo?

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