77D injection pump

Olliejunkie · Jul 2, 2017

Brought home a 77D knowing it had a fuel problem. Found that the plunger is broke. Now I'm trying to get the head off a spare pump but can't get it timed as it won't rotate. Any ideas on how to get it apart?

Olliejunkie · Jul 2, 2017

(quoted from post at 14:25:10 07/02/17) Brought home a 77D knowing it had a fuel problem. Found that the plunger is broke. Now I'm trying to get the head off a spare pump but can't get it timed as it won't rotate. Any ideas on how to get it apart?

D F S.D. · Jul 2, 2017

I have saved 4 heads that were stuck but they were out of the pump. we had cut the pump apart to get the head out the pumps were junkers but the heads were not broke. call me
at6zero five22eight 3zero 2 six I would like to talk about it David

RBoots · Jul 2, 2017

Never had a fleet line pump apart. How did
you find the plunger had broken? Did you
have to take the pump apart? I've got a 770
that runs real good, but doesn't start
worth a darn. Will crank all day with smoke
out the exhaust but won't start unless it
had been previously running. Pull it 2 feet
and it'll start right up. Could be valve
recession, but I wonder if it is a pump
issue instead. I'll probably find out when
I rebuild it this winter.

Dieseltech · Jul 2, 2017

DON'T time it, remove the oil screw and control unit and pry the head out as is. The top plate will be broken on the quill drive gear but it's not needed anyway IF the cam and tappet are in the correct location on re-assembly. E-mail is open on Classic if you have more questions..

Olliejunkie · Jul 2, 2017

Thank you I thought about doing that but didn't know if I should break the tin. I won't use it if I put the head in the other pump.

Olliejunkie · Jul 2, 2017

I'm sure someone else will give you advice on your starting issue but if the plunger was broke it wouldn't run. Mine was not getting fuel to the injectors so I pulled the head and found broken piece's.

Tramway Guy · Jul 3, 2017

If yours will run at all, I guarantee your plunger is not broken. If it starts unaided when it is hot, your plunger is probably not worn out, either. When the plunger is worn, warm (thin) fuel will leak past the plunger/barrel and not get to the nozzles at cranking speeds.

Excessive cranking when cold, with smoke, indicates that you probably have low compression issues. Or perhaps injector nozzle issues (poor spray pattern, cracking pressure, or maybe energy cell problems).

RBoots · Jul 3, 2017

Thanks Tramway Guy. It runs really well, no smoke, lots of power, but does have low oil pressure. That's why I'm just gonna rebuild it this winter and get the head and injectors done while I'm there.

Olliejunkie · Jul 3, 2017

(quoted from post at 13:18:52 07/03/17) Thanks Tramway Guy. It runs really well, no smoke, lots of power, but does have low oil pressure. That's why I'm just gonna rebuild it this winter and get the head and injectors done while I'm there.

Did you check out pressure at the engine with a low pressure guage? They do not run much. Also the relief springs get weak and you can bump pressure by giving them a little stretch.

J. Schwiebert · Jul 3, 2017

I send you an e-mail. Did you receive it? J.

Olliejunkie · Jul 3, 2017

(quoted from post at 14:32:42 07/03/17) I send you an e-mail. Did you receive it? J.

No. I haven't seen an email yet. I pried the head out but still haven't got the plunger lose. Might be broke or twisted. I liked your idea David but haven't been able to get to town. Trying to figure out how to get the seat out of the top now. The spring is compressed. Guess I should just be patient and let it soak.

RBoots · Jul 3, 2017

Yep I got it a little bit ago John, and sent one back at you. Thank you

Ross

77D injection pump

Olliejunkie

Well-known Member

Olliejunkie

Well-known Member

D F S.D.

Member

RBoots

Well-known Member

Dieseltech

Well-known Member

Olliejunkie

Well-known Member

Olliejunkie

Well-known Member

Tramway Guy

Well-known Member

RBoots

Well-known Member

Olliejunkie

Well-known Member

J. Schwiebert

Well-known Member

Olliejunkie

Well-known Member

RBoots

Well-known Member

Similar threads