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help 650 diesel

A

Anonymous-0

Well-known Member
Trying to bring a 650D back to life. Has benn sitting for number of years, Got it to run good on gas but with a lot of white/grey smoke. On diesel, will run but not fire on #3 cyl. Lot of light grey smoke when running on diesel also. Had injectors rebuilt and injection primary pump was rebuilt and pump was flow tested. Showes good pressure on diesel pressure gage. Compression test on gas side is 90 PSI and and same as other cyl. No blow buy noted on starting valve when spark plug is out and running on diesel. NO bubles in radiator when running. No water in oil. Have interchanged injectors and miss stays with #3Cyl. Lot of unbburned fuel in #3 injector when pulled. How can I check compression on the diesel side? Do I need to pull head? Thanks for any help.
 
When you bleed it do you get fuel to #3? You need a special adapter to check compression but it can be done. No, the head has to stay on or there would be 0 compression.

Can't you crack the line at the nozzle and check there too?
 
My first thought would be you have a starting valve stuck open on #3. Quick check leave the change over lever on diesel & crank it over with the starter. Will be able to hear the difference when #3 comes up on compression, will turn over easier.Could also remove #3 spark plug , should not get compression out the plug hole on diesel. Can remove the valve cover & rocker arms and free up the valve.
 
Hi Could be a plugged injector you could try # 3 injector on an injector tester, if you don't have easy access to a testor move the # 3 injector to another cylinder if the miss follows the injector I think it would be an injector problem, if it stays at # 3 cylinder could be a valve or other issue. Good Luck.

Cheers

Russ
 
(quoted from post at 20:48:50 05/27/12) Hi Could be a plugged injector you could try # 3 injector on an injector tester, if you don't have easy access to a testor move the # 3 injector to another cylinder if the miss follows the injector I think it would be an injector problem, if it stays at # 3 cylinder could be a valve or other issue. Good Luck.

Cheers

Russ
Click to expand...

He tried that and it stayed on #3.
 
(quoted from post at 20:16:13 05/27/12) My first thought would be you have a starting valve stuck open on #3. Quick check leave the change over lever on diesel & crank it over with the starter. Will be able to hear the difference when #3 comes up on compression, will turn over easier.Could also remove #3 spark plug , should not get compression out the plug hole on diesel. Can remove the valve cover & rocker arms and free up the valve.
Click to expand...

Good call. Wouldn't the plug be pretty fuel covered and nasty if that was going on?

That would also explain nasty white smoke when running on gas. That cylinder is probably loaded with diesel.
 
When running on diesel and spark plug removed, there is no leakage, or blowbuy out the spark plug hole. Valves are all free.
 
Diesel compression check is the next move. I think you're gonna find though that the distributor block in the pump has to be rechecked. If you tell the pump shop your troubles and what you've done to diagnose the problem they should put it on the bench and check it again (especially cyl#3) for free or next to free.
Good luck.
 
I don't know where you could find one. IH had a set up where you could hook it up between the injector line, was also the nozzle test kit. You could check the compression with it running on diesel. If you crank it over with the starter on diesel can you hear one cyl go over easier? Should be an obvious change with that bad of a miss. Sounds like you are low on compression on that cyl. They would have to be way off on the distributor valve shimming to make that bad of a problem.
 
The only place he could have a compression problem is in the starting valve if it tests fine on gas. Just thinking out loud.
 
the pump was only flow tested. not rebuilt. it has to be a sticky or bent starting valve(most likely) or a stuck valve or tappet in dist. block
 
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