dongfeng tractor with y385t wont start help

[reelnative]

Marine mechanic. So you've dealt with diesels before.
Mmmm, maybe not.

If I remember right you had removed the injectors and then cranked it to see about fuel delivery, correct?
What did the spray pattern look like? And how much, was it addiquate?

I'm thinking, this system doesn't by any chance have an electricly controled shut-off valve does it?
A failure there either electricly or in the selinoid itself would explain a whole lot of things.

well as a marine mecanic, I have worked on all sorts of motors and engines from old 2 stroke larks with glass fuel bowels to 2000hp blown drag boats and lots of large yachts with monster sized diesel motors, but with the diesel motors most of what a mecanic does is do fuel samples, change fluids andfilters and tighten up things that rattler loose, most people with million dollar plus boats with large diesels dont fix things they replace them, so in my work on diesel engines on boats most of it is, upkeep and eng swap outs, but i have owned many diesels in my life and have allways tryed to do all the work on them myself, as for the elect shutoff no these tractors like most have a gate that is man shut off by pulling a cable that leads to the ip pump

 

[reelnative]

can anyone tell me if the injectors spray on a compression stroke or up stroke on these engines or do they spray when not under pressure, my injectors have a nice cone spray pattern out of the tractor but im thinking that the ip might not be working right under pressure if the injection event happend on a compression stroke, kind of how sometimes a spark plug will fire ok outside of the block but under pressure wont work

 

[rsallen]

With all due respects Mr. Rooks.
I did not ask about any electricly pulsed injectors.

I asked about a shut off valve.

That's why I asked Reeinative.
I didn't know, because on my old Kubota I had to manually shut down the engine while on my new to me TC N.H. I only need to turn off the key. Which means to me theres an electric selinoid someplce in the system. I haven't looked for it yet, but I know it's around somewhere.

Anyways I thought it'd be worth asking.

 

[rsallen]

Those injectors open at probably around 1900#'s.
If the pressure is there to open them they'll spray.
Don't be tempted to put your finger over them as they work unless you want to be injected with diesel fuel.
It's high enough they'll push fuel right through your skin.

 

[reelnative]

well i ran the comp test and cyl one had 120psi cyl two had 422psi and cyl 3 had 200psi, I thought that was weard so i did it again and they were all the same so I pulled the head, a few things i noticed is those head bolts were extreemy tight I would guess around 175 foot pounds each give or take a few pounds and also I couldnt see any blow by on the gasket is this normal for this tractor ?

 

[Ross71]

It's gone midnight here. I'll comp test my 254 in the morning unless someone beats me to it. Can't comment about the head bolts- who assembled the tractor? Dealer, or customer?

Mr Allen- it is a solenoid

 

[reelnative]

ok guys i put my thinking cap on while eating dinner and this is what I have come up with, I think the PO over heated this tractor and thats why it died on him out in the field, and he left it there, the compression on the front and rear cyls were 120 on the front and 200 on the rear, the 4 head bolts in the center of the motor around the center cyl were hard but not wicked hard to get out and that cyl had 422psi, the outer head bolts that are around the outer cyls were a bear to get out so im thinking that the head got hot and the outer edges curled enough to blow the outer cyls and thats why the head bolts were so hard to get out they were streached until they moved enough to blow the gasket, im going to take the head in to be checked, these head bolts look pretty beefy should i still use them over, im thinking if the head comes back ok then ill use them but if it needs milling from warping then it might be a really good idea to get new ones cause that would mean that they had a good streach put on them, or am i wrong and they should be good eather way thanks guys

 

[Diamondpilot]

well i ran the comp test and cyl one had 120psi cyl two had 422psi and cyl 3 had 200psi, I thought that was weard so i did it again and they were all the same so I pulled the head, a few things i noticed is those head bolts were extreemy tight I would guess around 175 foot pounds each give or take a few pounds and also I couldnt see any blow by on the gasket is this normal for this tractor ?

120# is way low. Thats what we see on little 6 to 1 Gas Farm Engines. This engine is 18/20 to 1.

Sounds like you have two cylinders that have issues.

Parts are cheap so replace the bolts and gasket then have the head magna fluxed and milled.

Chris

 

[reelnative]

yea the tractor has 22 to 1 comp so yea 120psi is piss pore and 200 is way bad also

 

[Bob Rooks]

With all due respects Mr. Rooks.
I did not ask about any electricly pulsed injectors.

I asked about a shut off valve.

That's why I asked Reeinative.
I didn't know, because on my old Kubota I had to manually shut down the engine while on my new to me TC N.H. I only need to turn off the key. Which means to me theres an electric selinoid someplce in the system. I haven't looked for it yet, but I know it's around somewhere.

Anyways I thought it'd be worth asking.

Please re-read my post.