2.25 thermostat

**discopete** · 26th April 2009, 08:22 AM

G'day folks,
a couple of questions before I replace the thermostat in my 2.25 petrol 2a. Firstly, do I use a 74 deg or an 82 deg, why the different temps? And secondly, after reading the extract below I'm confused on which type of thermostat I should be using. The Bellows ones seem to be available still, but the one I'm replacing is a normal aftermarket one.

Cheers,
Pete

Bellows Thermostat ‘work around’
The bellows thermostat used in the 2.25 engine
is no longer available. Just replacing one with a
conventional type thermostat will not do the trick
because much of the coolant will bypass the ra-
diator.
The bypass circuit allows coolant to be circulated
within the engine before the thermostat opens and
prevents hot spots in the head that can cause crack-
ing. So you can not just block it off.
There are two alternatives: One is to replace your
old thermostat and bypass housings with the newer
Land Rover versions that have a built in restric-
tion.
The other method is to make your own restrictor
gasket that blocks off the bypass housing except
for a single 3/8 inch dia. hole: then use a thermostat
that will ﬁt your existing housing.
If you make your own bypass restrictor gasket, the
correct thermostat to use is 532453 (165 degree)
or 596225 (180 degrees)

**Blknight.aus** · 26th April 2009, 09:12 AM

the petrol likes the 82 if your down south and the 74 if your up north.

ignor that gumpf you quoted.

the only thing you have to worry about is if you get a non genuine thermostat and its got the little check valve in the flange. rip that puppy out and clean up the hole with a 1/8th inch drill bit.

I routinely use the thermostats from super cheap in the 2.25's.

dont forget to hylomar the gaskets and let them sit for about 10 minutes before assembly and then when its all torqued down about an hour before you add coolant.

d@rk51d3 · 26th April 2009, 02:17 PM

Should there be a spacer over the top of the thermostat? Looked to fit one the other day, but the thermostat tends to flop around, and looks like it needs a ring under the cap to hold it in place.

**discopete** · 26th April 2009, 03:17 PM

Originally Posted by d@rk51d3

Should there be a spacer over the top of the thermostat? Looked to fit one the other day, but the thermostat tends to flop around, and looks like it needs a ring under the cap to hold it in place.

Just had a look at my setup and yes it seems to have some movement like you have just described. Has been working that way for 2-3 years.

Pete

**Blknight.aus** · 26th April 2009, 04:09 PM

the OEM Item has a lip, you dont need it but its nice to have.

the after market items either have a wave in them, a side folded up or dead flat.

any one will work.

Thread: 2.25 thermostat

Thread Tools

2.25 thermostat

Bookmarks

Bookmarks

Posting Permissions