Thermostat Housing

tstracha · Jan 22, 2023

I just installed a new head gasket in a David Brown 1410. When I was topping up the coolant I noticed it was leaking from the bottom of the thermostat housing, which is part of the head. Pulled out the thermostat and found a 1/2" hole in the bottom of the housing. This looked like a machined hole. Is there supposed to be a plug in this hole or does it connect to something? Can't find anything about it in the manual. Thanks for any suggestions.

used red MN · Jan 22, 2023

Hello TS welcome to YT! I am far from a David Brown
expert in fact I know next to nothing about them. Did
you take the head to a machine shop to get it worked
on? Sometimes they take out or knock out all plugs in
the head. I do not know how many shops still use hot
tanks most have high temp bake ovens they use to
degrease and clean the parts. In the hot tank days the
caustic solution would eat on areas that had rust or
other corrosion. Then when the engine was put back in
the expansion plug might start leaking. So a practice
of removing them to make certain they were replaced
was started and it also allows for a more thorough
cleaning after the tank or oven process. Maybe you
need to acquire a 1/2 inch expansion plug from an auto
parts store to drive in there. The CNHI online parts
diagram does not show any plugs in that area, see
attached. Hopefully a DB expert will drop by and shed some real knowledge on this. Also for future reference this site has a Case and David Brown specific topic section, I will also place a link for that.
CNHI DB 1410 online parts diagrams

YT Case and DB topic section

Thermostat Housing

tstracha

New User

used red MN

Well-known Member

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