gasket or not

[RCC]

Hey TRS's,

Got a quick question about 4.0 coolant outlet pipe.
Changing the thermostat on my truck. Got a new t-stat
and the fancy rubber seal ring. When I started to clean
the mating surfaces, noticed there was NO gasket between
the manifold and flange of the outlet.
It had what appeared to be some sealer used there.
It's not silicone stuff. Was dark and hard set.

Is there supposed to be a gasket or is it normal practice to
use a chemical sealer??

RCC
that

 

[289-tiger-]

The rubber o-ring on the t-stat should be all you need on the 4.0 ohv.

Good luck

 

[RCC]

Hey tiger,

Thanks for the info.
Sorta figured the rubber ring does the job.
Once I got the sealer off the pipe flange,
noticed some slight pitting where the old
rubber made contact. Dressing that up with
fine emory cloth before bolting it back up.


What year Sunbeam you got?

Rc

 

[289-tiger-]

No problem. At the moment a 65 and a 67.

Good luck

Why do the british drink warm beer?...They have Lucas refrigerators.

 

[RCC]

Hey 4.0 owners,

I changed my thermostat recently.
When refilling radiator, went through the procedure
listed in manual to purge ALL air from the system.
The temp gauge acted weird on the road.
Read steady most of the time. Suddenly drop to near
"C" for about 10 seconds. Then return normal.
Would do this at random intervals.
Figured there still had to be some air trapped.
Did the purge routine again.
Appears to be OK now. Will see after a few days.

Read other articles on the web from people complaining
of similar experience. Having to purge their motors several times.
Why does it seem more difficult eliminating all the air in
these cooling systems?

 

[289-tiger-]

Had the same problem on my 94, on early models there is no bypass valve to the heater core. If it reoccurs check for a plugged heater core. Simple test is to disconnect the two lines to the core at the firewall, connect them together and see if it makes a difference. Hopefully on a warm day.

Good luck

 

[RCC]

Hey tiger,

Read something on the web about a by-pass kit for the earlier
4.0's(and 3.0's). Even had some part numbers. When I did a
search for them, no supplier came up. Hmmmm?
My Ranger never had this glitch until recently.
Got me thinking about the heater core. When the gauge was
jumping around, heat was on near max. Turning the heater temp
down did appear to reduce needle fluctuation some.

Anyway, took the truck for a little road trip today and had no
problems or temp gauge weirdness. BUT it was warm enough
I wasn't using heat.

RCC

 

[289-tiger-]

Sounds like you have a handle on it. Without the by pass ( and or clean and clear heater core) it will trap air in the system and cavitate. On the early models coolant is constantly circulating through the core to the engine. The heater control only opens and closes a door to allow heat into the circulation system. It threw me also how adjusting the heat would affect the temp gauge (in reverse) but at least here, problem solved.

Good luck