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Indirect Inject Diesel Question

F

fpappal

Member
I have a little Mitsubishi KE70 diesel which is indirect-inject. Compression is reading about 320 in each cylinder. Can I squirt some oil down the glow plug hole to see if the compression goes up? Or is the glow plug hole not the best route to get some oil into the cylinders? I forgot to turn the fuel off when I checked for compression so I am assuming the cylinder walls have been washed down by the diesel fuel.
Thanks.
 
I doubt you did any damage , now i have never been in one of those engines so i do not know how there precombustion chambers are . Now as to what the compression should be ?????? on it BUT for the most part if like others your close .
 
Oil in the glow plug hole OR injector hole will go into the pre-chamber first, then get to the piston area from the pre-chamber port. I doubt you have fuel washed cylinders, more like piston/rings wear as 320 is low for a pre-chamber engine. Does engine start/run at all? has the valve lash been adjusted?
 
You can take a gallon of diesel fuel and mix a quart of engine oil into it and pour into your tank. That oil will eventually get to the pistons and lube things up a bit.
 
i would not say the cyl's are not washed. if your spraying diesel into them checking compression it wont get any better than that. seams kinda lowish for a diesel. is this thing running or what is the story? plus from the first cyl. u checked to the last one is there a difference?
 
Service manual says pressure should be 450 lbs and rebuilt at 370 lbs. Tractor started on its own a month ago, ran just fine until the clutch failed. Got it back to the barn while it was still running and I am the one who turned it off. Ever since then the tractor will not start, just turn over and blow white smoke. I originally was getting 380lbs and 340lbs. I decided to replace injector nozzles and now I am getting 320lbs. I used new copper washers and torqued to the proper specs. I have not checked the valves, I am going to do that next.
 
Tractor not currently running. Both cylinders are reading 320 lbs. Tractor was running, always hard to start, now won't start at all.
 
Most pre-chamber engines need 400-450 to have enough compression heat even WITH glow plugs to start. If engine has a block heater, using it too SHOULD help get it started. Also make sure battery, starter, and cables are in good condition, low cranking speed just makes everything worse. Cranking a known GOOD engine slow can also give the results you have too.
 
have u confirmed you have diesel shooting out when cranking engine with lines removed from injectors? also is thee any exhaust smoke cranking it?
 
As stated, 320 is very low. I work on pre-combustion chamber Onan diesel generator engines, and the minimum compression per specs is 400PSI. 30 seconds of glow plug operation is also needed, but engines fire right up. If all the cylinders are 320, then, most likely, stuck rings, worn bores, valves need done and/or set. Timing doesn't change unless someone has messed with the pump.
Using oil or diesel in the cylinders to check for increase in compression may be an issue - don't forget these engines are compression ignition, and the oil/fuel may compress enough to light off. zuhnc
 
ooh so now i see when it would not start you replaced injectors and the compression is now lower. nice to get ALL info right at the start. so who knows if its the gauge or waht. just give it a sniff of starting fluid WITH OUT using glow plugs. it will start.
 
What are you hoping to do with this motor? How many hours does it have on it? From the compression you are getting it sounds like it needs a rebuild. Are there other issues that are preventing you from spending the money on a rebuild?
 
This tractor is the exact reason why I cannot go to auctions. It has a tiller on it and that is basically all it can do and why I bought it. I can get new clutch,pressure plate, and bearing for around $300. Prob another $300 for rings and head gasket. I am up for the challenge, it just boggles my mind why it started, ran fine, and now is dead.
 
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