My 45 MB did not have a thermostat when I bought it. I found this out when I was doing a valve job. I also measured the cylinder bores for wear while the head was off. Cylinders 2,3&4 were within acceptable limits. Number 1 was .025 inch oversize. The cylinder was egg shaped directly behind the water pump. I later bored and installed oversize pistons to correct this. I had to go .060" over because the wear was all on the front side of the cylinder. I think this wear was due to running without a thermostat. I bought a thermostat and installed it.
---- you wrote:
> Well,
>
> ....and while dismantling the head, noted that
> there was NO THERMOSTAT installed at all.
>
> I did not have a spare thermostat and put it back
> together without one and the engine has since
> done it's job without trouble.
>
> SO, this engine has been running for at least the
> past 15 years without a thermostat. It has had no
> problem running cold or hot, the operating cooling
> water temperature was always well below 180 deg.
> and as several felllow enthusiasts told me it is one
> of the smoothest running jeep engines they have
> come accross, I just wonder what it matters if there
> is no thermostat installed.
>
> O.K., I know what the thermostat is there for and I am
> familiar with the theory of engine thermics and its
> influence on wear and tear and operations.....
>
> But this engine is a perfect runner and the Jeep is
> one of the fastest around (70 mls no prop and good
> accelerating ). Over the years I did note any wear and
> tear and had no operating problems.
>
>
> .... now explain t h i s !
>
> Lars-Uwe Rudek
> MVPA # 14836
> MVT # 8119
> T.E.A.M. # 2
> <RUDEK@SHH-HAMBURG.DE>
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