Jd 350 dozer

jim in Newberg · Aug 4, 2014

Hi I'm taking the head off because of water in the oil. Do I have to remove the injector nozzle assembly, or can I do that once I remove the head? Also when do I remove the springs on the opposite side of the push rods?
Thanks, Jim

MSM · Aug 4, 2014

It would be wise to remove the injectors before trying to remove the head. It doesn't take much of a bump to mash a tip.
There is no need for you to remove the valve springs. Take the head to a machine shop and have it gone through, checked for cracks and reassembled with the proper valve stand out.
Hindsight being 20-20 you should have pressurized the cooling system with the oil pan off before you loosened the head so you could see which cylinder was leaking coolant. Most likely it has a pitted liner which is a common problem if the coolant wasn't changed/maintainer properly.

tim s · Aug 4, 2014

The head is "not" your problem it is the liners..yes you can remove the head with out pulling the nozzles, just be careful when you set it down they protrude below the head a bit.You may as well put a piston liner kit in it now....

JDemaris · Aug 5, 2014

It would behoove you to pull the oil pan and look
for rust marks below the sleeves to see if that's
where the leaks are. The old 350s only had one
seal per sleeve and often leaked over time. New
sleeves will have three seals per sleeve and are
much better.

Valve springs only come off if you want to change
them, or do a valve-job.

Injectors can stay in the head. In fact -sometimes
pulling the head off and then pressing the
injectors out from underneath is the only they to
get them out if really stuck.

jim in Newberg · Aug 5, 2014

Thank you for the info. Do I have to pull the motor to put sleeves in? Would it be a good idea to do it since I have it torn down? Should I be getting a mobile mechanic to do this?
Jim

(quoted from post at 04:34:33 08/05/14) It would behoove you to pull the oil pan and look
for rust marks below the sleeves to see if that's
where the leaks are. The old 350s only had one
seal per sleeve and often leaked over time. New
sleeves will have three seals per sleeve and are
much better.

Valve springs only come off if you want to change
them, or do a valve-job.

Injectors can stay in the head. In fact -sometimes
pulling the head off and then pressing the
injectors out from underneath is the only they to
get them out if really stuck.

JDemaris · Aug 5, 2014

You can do an "in frame" engine rebuild as long as
the crank is OK. With the pan off and head off,
it's pretty easy to put in new sleeves, pistons,
rings, oil pump gears, crank and rod bearings.

Jd 350 dozer

jim in Newberg

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MSM

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tim s

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JDemaris

Well-known Member

jim in Newberg

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JDemaris

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