Yanmar mp4 4tnv98 help

If I understand correctly I asked about this pump in another thread, I think Yanmar made it themselves and TPG says it is not such a great design anyway?

rmll> in the 1st pic of the front of the pump.. I can SEE the timing mark.. its right inline w. the key.. small "dash" on the pump housing.. you should be on the right cyl.??

rmllarue91 said: Idk if i'm looking at this wrong but I think the pump needs to be on certain position to do timing Click to expand... Hello ramuel, did your engine start? I'm encountering the same problem as yours. I couldn't have any reference to timing the timing gear and injection pump,

rmllarue91 said: Hey hef im pullin my hair out tonight Got a 4 cyl yanmar. injection pump gear was removed and was given pump seperate from engine. They pulled four bolts instead of large nut. I reringed and resealed engine. When all timing marks are aligned for pump gear, crank and ,cam. the cylinder closest to timing cover both rocker arms are loose. Which according to manual is cylinder 4 and is on tdc. How do I know injection pump is on the right cylinder? I can measure the plunger to set precisely set timing with a dial indicator. But that could be on any of the four output lines if im understanding this. And once I firgue out where to have pump what cylinder does it fire to? Looks like cylinder 4 which is closest to timing cover if im reading this right. Thanks hef Click to expand... hey rmll did you ever get this sorted out? does the pump have a mark for #1 TDC?

I have read this thread a couple times. Im still a bit confused, and seeking more details. I will add pictures. What is the correlation between the keyway on the injection pump to the injection pump drive gear? I have a similar situation, full engine rebuild and unfortunately injection pump gear was taken off. How do i determine tdc #1 on pump? I have not identified any markings yet.

FixingTractors said: I have read this thread a couple times. Im still a bit confused, and seeking more details. I will add pictures. What is the correlation between the keyway on the injection pump to the injection pump drive gear? I have a similar situation, full engine rebuild and unfortunately injection pump gear was taken off. How do i determine tdc #1 on pump? I have not identified any markings yet. Click to expand... This is a rebuild on a john deere 110 TLB. (4TNV98-MJTLB

Welcome to HEF Fixing Tractors ! The machine's serial number is always helpful. The serial break has different injection pumps. Check your messages (based on your photos).

I rebuilt a Yanmar 4TNV a couple years ago. If I remember correctly there is a timing pin that goes through a hole in the gear then through a slot in the pump drive flange and into the front face of the pump while the engine is at TDC. I think I used a metric drill bit.

Thank you for the replies!! Ill update with vin and injection pump serial# monday, this has been very helpful

mg2361 said: Welcome to HEF Fixing Tractors ! The machine's serial number is always helpful. The serial break has different injection pumps. Check your messages (based on your photos Click to expand... Engine is 4TNV88-MJTLB Serial #. CH4022D200254 john deere backhoe vin (LV0110T410335)

The information I sent would be the correct information based on your serial number.