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Now that you have the relief valve reinstalled correctly, the only
other variable is the oil. I suggest you drain the gearbox/OD and
refill with the same oil you use in the engine. I've owned two MGBs
with OD and always used engine oil. It was Castrol 20-50 until I
changed to Valvoline racing oil of the same grade after the
flat-tappet scare started going around. Never had any trouble with
the ODs and I drove both cars plenty.<br>
<br>
CR<br>
<br>
<div class="moz-cite-prefix">On 1/18/2019 10:32 AM, Jack Wheeler via
Mgs wrote:<br>
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<div>Hi Paul. You are correct, I removed the low pressure
valve, NOT the pump assembly. I was looking at the manual and
the parts which came out appeared to be closer to those shown
as the pump assembly, but neither was the same as mine.
That's how I assumed it was the pump assembly.</div>
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<div>So, now that I have the low pressure valve installed
properly, the overdrive still does not engage. The other
thing I changed was the gear oil. I always used straight 50
Wt. motor oil in my overdrives, and that worked fine. Based
on a recent article in the Tech Issue of "MG Driver" magazine,
I switched to EP 85/90 GL-4 gear oil. Do you think this could
be causing the problem?</div>
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<div>Thanks for your help.</div>
<div><br>
</div>
<div>Jack<br>
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