Tell me I don't need an injector pump

Fred Werring

Well-known Member
398 Massey, 4 cyl turbo perkins, was out doing a little bush hogging, the tractor dies.

Started checking for fuel. While cranking, I'm getting fuel out of the lower bleed screw (marked 1 in the pic), but never get any fuel out of the top screw...marked #2.

Throttle and shut off cables seem tight and are where they're supposed to be...but of course this time while mowing, I got lazy and left the loader on, and of course it died in the middle of a multiflora rose patch, hard to see much right before dark.

Thoughts? Looking for ideas before I go back out there in the morning.

Thanks

Fred
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Have you primed it up with the hand primer on the lift pump? Did it run out of fuel? Sometimes they need a lot of purging to get the fuel to the top bleed screw. Slacken one injector pipe off a few turns and shake it a bit to break the connection . Try to crank it and keep slackening the bleed screws ...tightened up to finger tight should be good enough to start the engine. When the engine runs you can tighten the injector pipe. CAUTION wear adequate protection as diesel fuel can harm your skin!
Sam
 
Loosten the injector line nuts as Sam mentioned. Make sure there is air free fuel at the lower bleed screw, it will never start if air is present here. The top cover bleed screw can be done later, it keeps the governor linkage covered with fuel to help prevent rust. If you still get no fuel at each injector while cranking you may have more serious pump trouble. Just mailed a 165 pump back to Michigan that had stuck plungers, worked fine after a complete teardown and cleaning.
 
Plenty of fuel in the tank.

Never tried the hand lever on the lift pump, figured cranking with the starter accomplished the same thing...is there a difference?

Cranking the engine gets me a lot of fuel out of the lower bleed screw...tightened it back up, loosened the top screw, never got a bit of fuel out of it.

So I need to break an injector line loose while looking for fuel from the top screw?

I did replace the lift pump last winter, actually that was my first thought what was wrong, but it seems to be working from what I'm seeing cranking the engine.

Thanks

Fred
 
Top bleed screw is seperate from injector line nuts, it can be bled later with engine running. Fuel must be at each injector with the nuts about 1/2 turn loose to get air out of each line while cranking with stop in run position. When you see air free fuel tighten the nuts and start engine. If you never get fuel at the injectors, you have pump trouble.
 
Upon further review...

THOUGHT I had good air-free fuel flow from the bottom bleed screw, but found that wasn't the case, all kinds of air. (in my defense, it was getting dark, was hot, tired, aggravated, blah blah blah)

Went back to my original suspect, the lift pump, found it's not pumping at all. When I opened it up, found both of the check valves had come un-staked from the casting. Ever had any luck staking those back in?

So I guess the fuel that was coming from the lower bleed screw was the injector pump moving fuel around, had I used the hand lever instead of cranking the engine, would have figured out it was the lift pump last night.

Thanks to you and Sam for the replies

Fred
 
I have had good results from restaking these valves in, but do it carefully so as not to distort the valves and make sure you have them facing the right way...one up and one down. I would say the Indian who assembled your new pump was a bit too light with his hammer.
Sam
 
Got a new pump coming, wont be here till next Wednesday.

Put the valves back in, staked them with a chisel and screwdriver, tractor was still running when I got it back up to the shop and got the loader off of it. The hood won't open but 3" with the loader on, makes it fun getting it bled.

I'll put the new one on when it gets here, maybe keep this one on a shelf for an emergency backup

Thanks again

Fred
 
It was an Ebay pump, lasted 11 months, had put it in cause the old one was leaky at the gaskets, couldn't get it to seal up

Closest Massey dealer is 80 miles away, the local NH dealer said they could get me one, wonder if it will be any better than the ebay pump...know it's costing about $20 more.

Thanks again

Fred
 

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