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1974 TR6 Oil pressure issue


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#1 Jazz13

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Posted 11 August 2018 - 10:50 PM

Have been trying to solve low oil pressure issue on my TR6.
Only seeing 10 psi on cold start up with 20/50 oil.
Replaced oil pump with new unit, primed the pump, saw 50 psi upon start up for a brief moment.
Dropped back down to 10 psi.
Replaced oil pressure relief valve, stem and spring.
Having a difficult time seeing oil pressure after start up.
Every time there after, only 10 psi.
Any advice?
Thank you
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#2 Mike C

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Posted 11 August 2018 - 11:37 PM

If the gauge was reading better  pressures with the old oil  pump then the gauge is probably OK,  I'd look at  the new pump's drive shaft, especially its engagement.


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#3 BlueTR3A-5EKT

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Posted 12 August 2018 - 06:02 AM

click on this VTR item  You need to scroll down to read it.

https://vintagetrium...r6-spinon.shtml

Peter W


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#4 Tim D.

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Posted 12 August 2018 - 07:49 AM

How worn is your engine?
Cheers
Tim
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Lover of old cars and old cars racing


#5 DaveN

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Posted 12 August 2018 - 08:20 AM

What’s it reading after a run at idle and at say 2k rpm?
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#6 Waldi

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Posted 12 August 2018 - 08:33 AM

click on this VTR item  You need to scroll down to read it.
https://vintagetrium...r6-spinon.shtml
Peter W


Good info Peter, thank you.
Waldi
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#7 BlueTR3A-5EKT

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Posted 12 August 2018 - 08:47 AM

Good info Peter, thank you.
Waldi

Waldi,

Did you read the other items on that link/home page.  They are informative and helpful.

Peter W


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#8 BlueTR3A-5EKT

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Posted 12 August 2018 - 08:50 AM

Waldi,

Did you read the other items on that link/home page.  They are informative and helpful.

Peter W

Here https://vintagetrium...rg/maintenance/


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#9 alec

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Posted 12 August 2018 - 09:37 AM

Is a oil cooler fitted with thermostat.

 

Refitting new oil pipes.

 

Accidental reconnected my pipes on the thermostat the incorrect way & caused drastic low oil pressure reversed pipes & oil pressure returned to normal


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#10 astontr6

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Posted 12 August 2018 - 10:45 AM

Have been trying to solve low oil pressure issue on my TR6.
Only seeing 10 psi on cold start up with 20/50 oil.
Replaced oil pump with new unit, primed the pump, saw 50 psi upon start up for a brief moment.
Dropped back down to 10 psi.
Replaced oil pressure relief valve, stem and spring.
Having a difficult time seeing oil pressure after start up.
Every time there after, only 10 psi.
Any advice?
Thank you

How good is the seating of your pressure relief valve? Is it being held off for any reason i.e. a lump of crud or a worn seating?

 

Bruce.


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#11 Waldi

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Posted 12 August 2018 - 08:30 PM

Thanks Peter,
Made a link on my PC to the VTR site, I never came across this before.
Waldi
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#12 Mike C

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Posted 12 August 2018 - 10:47 PM

Did you compare the old and new spring lengths and check for washers used as spacers on the old PRV? It's amazing what has been done to oil PRV's over the years by various owners..

 

My spring length was too short  according to the BB ( but oil pressure was acceptable).When I replaced the short spring with the correct item  the oil pressure went to 100+ psi on cold, fast idle- so I went back to the old spring and accept that some things in my 1969 engine are no longer in accordance with the BB due to modifications made by various parties  over the tears.


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#13 hot-growler

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Posted 13 August 2018 - 06:34 AM

have you tried measuring on a different gauge? 


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#14 Jazz13

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Posted 13 August 2018 - 03:11 PM

Yes, have separate gauge on relief valve.
And have brand new spring and stem installed in relief valve.
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#15 oldtuckunder

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Posted 13 August 2018 - 03:37 PM

As we seem to have lept to the now, how about a bit of history to when this started.

 

Like since you have owned the car, only this summer after 30K otherwise good miles, slowly dropped off over the last few years, after you changed an oil filter?

 

How have you fitted a gauge to the relief valve?

 

Alan


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We could lead Brexiteers to Water, but we could never make them Think!

 

Still no warning points!  :rolleyes:


#16 Waldi

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Posted 13 August 2018 - 03:42 PM

And did the new plunjer move freely in the casing? My new plunjer had a very narrow clearance, radially, one burr will make it stick, resukting at low oil pressure at low revs.
Waldi
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#17 Mike C

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Posted 13 August 2018 - 11:02 PM

If the old plunger looks OK, with smooth  mating  surfaces, I'd try the old plunger with a new spring.


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#18 Jazz13

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Posted 14 August 2018 - 02:51 AM

Bought the car beginning of the year, and started to restore the interior. New seats and carpet.
Needed a new alternator and did the usual oil change etc. But never drove it since the interior needed attention.
Had an oil change on the relief valve which showed the same as gage.psi.
Have two sets of dash board, gages, oil pumps, all from a gentleman which rebuild his car from scratch.
Plunger is moving freely. Rebuild the two Stromberg carbs.
Engine was supposedly rebuild a couple of years ago, and car had been sitting since then.
Next option would be to check main bearings, to see if oil leaks through them?
Going to measure with plasti gage and determine size. Might have been machined and wrong set installed?
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#19 Mike C

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Posted 14 August 2018 - 04:00 AM

I guess the car had low oil pressure when you bought it- hence the oil pump change. The brief 50 psi on start up indicates that the main bearings were OK but something  has moved somewhere in the lubrication system/components.

 

Maybe check the main bearings and oil pick up- if only to give you peace of mind. 


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#20 DaveN

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Posted 14 August 2018 - 07:46 AM

Does it have a remote oil feed to the rocker shaft?
Check the crank end float,
Pull the bearings and check the condition of the shells. Mains and big ends. Dont get them mixed up!!
Does it rattle on start up cold?

I would think if its giving 10psi at all times then the drive to the pump is ok

Edited by DaveN, 14 August 2018 - 07:47 AM.

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