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Triumph Torque    Cars    2000/2500/2.5PI  ›  Low oil pressure
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January 22, 2007, 9:15am Report to Moderator

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After going for an out of town drive the oil pressure light comes on under 1200rpm and also sometimes after just driving around town for a bit. Any ideas?

Thanks guys
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Richard B
January 22, 2007, 10:25am Report to Moderator

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Assuming the oil level is ok, sounds like a potential rebuild; new pump and bearings I'm afraid.

Surrey AO and Triumph Hoover, Location: Guildford - Surrey,
Spitfire 2.5PI - 1967 having surgery, PI Saloon - 1969 RBRR x 3, PI Estate - 1969 (to restore), Stag - 1971 RBRR x 2,
PI Saloon MkII - 1971(stalled project), Sold some cars!  

Daughters own: Herald 1500 1961, Herald 1500 Coupe 1962, Dolomite 1300 1976, Herald 13/60 Estate 1970
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January 22, 2007, 11:00am Report to Moderator

Maldon, Essex :-)
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It could be a faulty pressure transmitter - my Sprint did this once, put a gauge on, showed ok, put a new transmitter on and everything went back to normal. 

Cheap and easy to do before you rip your engine apart!


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Lord Sorbington
January 22, 2007, 12:16pm Report to Moderator

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Worn main bearings would give low oil pressure would't they?  If they they were this bad would there be a bit of noise too?

Can worn big ends affect the oil pressure?  Had a Nova with knackered big ends once but oil pressure was fine.

I speak as someone whose 2000 has recently started to make a bit of a knock at idle even though oil pressure seems OK.  No rattle at higher revs as I'd expect with big ends though, or nasty noises on start up. Have got a fixed fan, not a viscous one so can rule that out.  confusing!

2000 mk2

Location: Sorbingtonworld

10CR 08
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January 22, 2007, 12:57pm Report to Moderator

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I know this sound's obvious -- has it got the right grade of oil in it?

Otherwise just what the other's have already said.

Assuming it's got the right oil then I'd pop the bonnet and listen to the engine to check for bearing noise when the oil warning light comes on. If you can't hear anything then I'd be tempted to check the wiring to the oil pressure switch and change the oil pressure sender.

If it persists then you've probably got an engine problem (e.g. could be bearings, oil pump etc)

Bill Murray
'78 Spitfire 2500 - Back in action
'76 2000TC Saloon - Getting mended
My other motoring vice:
'97 Land Rover Defender 90 300Tdi - "Big Red"

Blog: http://bigsixaddiction.blogspot.co.uk
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Nick Jones
January 22, 2007, 11:12pm Report to Moderator

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Also worth whipping the relief valve out and making sure the spring and plunger are still ok.  If this is not closing properly the oil will leak past before it should reducing pressure.


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013 & 10CR2015.
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

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August 6, 2007, 9:03pm Report to Moderator
Sane? what the hell is 'Sane'?
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Hmmm, just been fidling with the 2.5 we've pu tinto the mk1 estate. This car had a oil pressure gauge fitted to it when it had the 2ltr engine in it and this gauge was reading 10psi(!) when the engine was hot at idle, climbing to about 30 under load. Since then fathers ahs whipped the the relief valve out and replaced it with one from another engine we happened to have lying around the workshop. This has increased the pressure to 30psi at idle climbing to to 50ish under load.

Anyone know what standard pressures should be? this engine had its big end bearings replaced when we put it in but not the mains as we didn't want to do a full engine rebuild taking the crank out. It as also recently had an oil cooler fitted with thermostat

Really don't want to start stripping the engine since this car is supposed to be going on the 10cr!!

Triumph Vitesse Mk2 2ltr Convertible , a TR4 And a mk1 2000 estate as well!!- North Derbyshire

earn a little extra cash for those spares  http://adbux.org/?r=GigGleR
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August 6, 2007, 9:34pm Report to Moderator
If its stands still..........polish it!
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Is this when hot, or cold.

Hot, as long as you have over 30psi running under load, leave well alone!

Mine, when hot, has 25psi tickover and 50psi running, plenty!

Alan Chatterton
Triumph 2000/2500/2.5 Register

LYB864K   1972 Triumph Stag Estate (DEL 33)


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August 6, 2007, 9:47pm Report to Moderator
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yeah, it's 30psi at idle when hot and 45-55 under load. At least I don't have to try and get the damn thing back out of the car before september then!  

thanks for the peace of mind  

Triumph Vitesse Mk2 2ltr Convertible , a TR4 And a mk1 2000 estate as well!!- North Derbyshire

earn a little extra cash for those spares  http://adbux.org/?r=GigGleR
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August 6, 2007, 9:57pm Report to Moderator

Eat my dust!
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I think it's supposed to be 45-65 when hot at 2,000 rpm. But it's best to give it a good half hour running time as the pressure drops a bit once it's really warmed up.

1978 2500 S with Mk1 Pi engine Wade 'crazy' cam on SUs for now


Greeks in a Defender http://ofnofixedabode.wordpress.com

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