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Fluctuating oil pressure


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Hi, I have benefitted a lot from information in this forum and thought it was time I offered some information that others may find useful.

 

I have owned my TR6 for 30 years and so know the car very well, or I thought I did.

 

To cut a very long story short, the engine was rebuilt by a specialist when I was living abroad (car was in the UK) and some time afterwards I started to notice a very occasional momentary fluctuation in oil pressure which seemed to occur when cornering fast and tight, e.g. around a roundabout. It didn't happen in bends or on the straight, or on gentle roundabouts, so on most drives the problem never showed itself, and when it did, it was just the slightest flick of the oil pressure gauge needle.

 

The problem showed all the signs of oil starvation and I wondered whether the correct dipstick had been fitted during the rebuild, even though I added the correct quantity of oil after each change. As a temporary check I added an extra 1/2 litre of oil beyond the high mark on the dipstick and took the car for a drive. Problem solved.

 

However, further investigation with the sump removed showed that the dipstick was the correct one and that the feed pipe to the oil pump had come detached and was laying in the sump.

 

I recall that my Father had a similar problem with a Standard Eight when we were driving to Cornwall as a family - in this case the oil pressure must have disappeared completely as the big ends terminated.

 

This issue may be well known, but it had me baffled for a while and I couldn't see anything on the forum about it, so hopefully it may be of use.

 

Roy

Edited by 6TR
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Typical mistake if somebody is not familiar with the

way this pumps are delivered.

 

Had twice that problem when I had an engine on

the engine stand for completing I turned it upside down

and put the oil pan over the pump to extend the feeding pipe

as much as possible till it touches the pan.

 

Both of the pumps had the securing nuts loose, only hand tight.

Probably the manufacturer thinks everybody will make an individual

setup for the best depth of the tube......

 

By the way: I prefer to use a liquid gasket on top and bottom of the pump housing.

It is Loctite, normally used for gasket making of Porsche 911 aircooled between

the heads and the camshaft housing. It only works with no oxigene present

the rest pops away with the oil. Hope it gives better oil pressure due to no leaking.

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