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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 25651
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Have Perkins 4108 new rebuilt injection pump new transfer

Customer Question

Have Perkins 4108 new rebuilt injection pump new transfer pump and timed at Tdc but will not crank had injectors rebuilt any ideas
Submitted: 6 months ago.
Category: Small Engine
Expert:  Curtis B. replied 6 months ago.
Injection needs to be 18 to 22 degrees before TDC.???
Customer: replied 6 months ago.
What does that mean
Customer: replied 6 months ago.
Lined the timing mark up on the injection pump to the timing mark on the block
Customer: replied 6 months ago.
Is that in a*****
Customer: replied 6 months ago.
This Perkins is in a 1968 mustang skid steer
Expert:  Curtis B. replied 6 months ago.
Diesel engine has to be timed when the injection is BTDC, 18 to 22 degress . If you time it at TDC, the injection is too late and engine will not fire. There has to be a mark before the TDC, mark. Has to be on the compression stroke, # ***** cylinder. Pump should have been installed at the exact place it came off, with out moving the engine, as it is a keyed pump that would only go one way. What do you have now, any smoke when cranking? No smoke would mean there is no fuel to the injection nozzles. Do you have fuel squirting at the high pressure lines if you loosen them?
Customer: replied 6 months ago.
Yes lots of grayish smoke was told motor was not timed to pump by fuel shop has been turned over several times without timing not being right took pump off made sure that some add gear was lined up with pump at tdc
Customer: replied 6 months ago.
Yes fuel is making to the injectors real good
Expert:  Curtis B. replied 6 months ago.
Have the gears been disturbed? If gears have not been changed, how does the pump line up? With a keyed shaft to gear, with nut and washer, or with a timing pin that will only let pump go one place and held by three bolts?
Expert:  Curtis B. replied 6 months ago.
timing needs to be 18 BTDC. See manual pages. Set crank at 18 degrees BTDC, and install pump set to the TDC position.
Customer: replied 6 months ago.
The gears have not been disturbed the gear on the pumpkins up with the cam on the cam in the motor it has the three threaded studs with washers and nuts to hold in place
Expert:  Curtis B. replied 6 months ago.
Why was pump changed? Could engine be out of time by 180 degrees? Compression enough to ignite diesel fuel, 350 PSI?
Expert:  Curtis B. replied 5 months ago.
did you get it going? Please rate to close.