4239df engine

tractorhal · Oct 20, 2018

I have a 4239df 4cyl. that starts and then quits. The transfer pump was weak, changed, and new filter. Started up, no rpm's and quits, any suggestions?

Tx Jim · Oct 20, 2018

I'll bet the check valve on inj pump that fuel return line attaches to is clogged. Loosen the 2 screws on IP timing window to allow fuel to leak out. Start engine & if engine runs correctly then drive coupler in IP is failing requiring replacement. If engine runs correctly you can clean debris from check valve & reinstall,engine should run fine for a while but further damage could be done to IP & possible engine failure.

tractorhal · Oct 21, 2018

Tx Jim,
That worked.
I had started at inlet line, filter, transfer pump, line to IP, and checked JD parts break down but didn't find a screen or filter listed, just a fitting. There is not a good break down of the IP. Do you know if they manufacture the IP or is it a common brand?
I will remember you next time.
THANK YOU.

thepumpguysc · Oct 22, 2018

JD does not make that inj. pump.. the company is NOW called Stanadyne.. your tag may say RoosaMaster.. same co..
I've been rebuilding those pumps for a living for the last 30 years..
Contact me w/ any questions regarding it..

Tx Jim · Oct 22, 2018

You're welcome
JD as most engine manufacturer's outsource especially the rotary type injection pumps from company's such as Roosa-master,Stanadyne,Roto-diesel,Bosch. JD stopped having very many parts for inj pump available through their parts system many yrs ago.There is a spring loaded glass ball in clogged fitting on your IP that requires cleaning to reuse the fitting