Jd 4020

Tim boyd · Apr 18, 2019

Hi I'm working on a jd4020, I rebuilt this tractor a couple years ago. I put a new reliance piston and liner kit in it,had the pump checked out and had the head gone thru by a very good machine shop. I had all the pencil injectors tested and 1 was bad so I replaced it,prior to the rebuild the tractor smoked and used oil quite heavily,afterwards the tractor still smoked more than I was comfortable with,but didn't use oil. It has now maybe 70 hrs on it, and last summer the head gasket started to leak some on the right side while the owner was out round baleing. This is believe to be my fault because I DID NOT replace the head bolts and I DID NOT use any hy-tack and i DID NOT retorqe the head bolts.So I pulled the head off to replace the head gasket and found one piston severely carboned up ''almost the consistency of mud''. The tractor has no odd noise's and runs very well,starts right up. So with all that said my gut is telling me that I have a injector issue, any thoughts would be greatly appreciated. Thank you

tim s · Apr 18, 2019

I would blame the build up on the injector, you should have changed them all out,,head bolts should have been new, but a lot of them got re-used and didn't cause any trouble,, a good 2 or 3 step torgue down is best and on the old wide heads I use a bit of sealant around the perimeter of the head gasket,,and of course some kind of break in oil or additive..

Tim boyd · Apr 18, 2019

I orderd all new bolts and injectors aswell as a gasket set.

tomstractorsandtoys · Apr 18, 2019

Have the new injectors checked and we only use Deere head gaskets. I like the reliance kits but feel the Deere head gasket is better. Tom

Tim boyd · Apr 18, 2019

The new gaskets and injectors are comeing from deere, reliance was cheaper but i decided to go with deere

tim s · Apr 19, 2019

The only difference between the two is price...

D- · Apr 19, 2019

I have used Reliance kits since they came out.
On those 4020s I replaced the head bolts if they
were original grade five (wide head). Always retorqued
tighter than recommended (after running).
Never use sealant. Always replace injectors (usually
with remans).
Never had problems.

Tim boyd · Apr 19, 2019

Everyone i have talked to says the same thing too, but why no spray sealant? On auto and heavey truck its a common practice. Please dont take me wrong i will do as directed. Just a little curious on why not.

D- · Apr 19, 2019

If you had used that stuff and had to tear it down again because
you didn't retorque the bolts look at how much work you would have
cleaning it off.
If it's not needed why would you want to use it?

matthies · Apr 19, 2019

For the smoking problem, is it a late model with no precleaner above the hood? If so change the precleaner/filter that is above the air cleaner as nobody knows about them. And always replace pencil injectors and head bolts at overhaul. I do cheat and use a very lite amount of Right Stuff along the edges of the head gasket to help with corrosion there.

Jd 4020

Tim boyd

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tim s

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Tim boyd

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tomstractorsandtoys

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Tim boyd

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tim s

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D-

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Tim boyd

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matthies

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