[Fot] Help needed, TR250 engine rebuild oil pressure problems

Sun Sep 15 13:56:10 MDT 2013

I'm not sure that's worst case -- the bearings, either crank or cam bearings, could have too much clearance and that would require a full teardown, ye that doesn't seem likely if the engine rebuilder followed long-established practices.  One other item that hasn't been mentioned yet -- are you using an oil cooler with a thermostatic valve?  If it was installed improperly perhaps there's a way it could rob pressure from the system when the oil heats up and the valve opens.

Duncan
(Texas)

On Sep 15, 2013, at 10:13 AM, robertten1 at aol.com wrote:

> 
> 
> 
> -----Original Message-----
> From: robertten1 <robertten1 at aol.com>
> To: tr4racing <tr4racing at googlemail.com>
> Sent: Sun, Sep 15, 2013 11:11 am
> Subject: Re: [Fot] Help needed, TR250 engine rebuild oil pressure problems
> 
> Did you replace the Oil Pressure Releif Valve and its Spring ?  I would first hook up a mechanical test pressure guage at the Oil Pressure Switch in the block and see what readings you get.  Worse case ... the Pump could be at fault.  Lastly are you running the cannister filter or a spin on oil filter?
>  
> Best o Luck
> Bob T
> 
> 
> -----Original Message-----
> From: MadMarx <tr4racing at googlemail.com>
> To: 'Andrew Packard' <apackard68 at att.net>; '6 Digest' <6pack at autox.team.net>; fot <fot at autox.team.net>
> Sent: Sun, Sep 15, 2013 5:53 am
> Subject: Re: [Fot] Help needed, TR250 engine rebuild oil pressure problems
> 
> Could there any trouble with the pressure relive valve?
> I'm not familiar with the 6 pot engines.
> 
> Chris
> 
> -----Ursprüngliche Nachricht-----
> Von: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] Im
> Auftrag von Andrew Packard
> Gesendet: Sonntag, 15. September 2013 02:56
> An: 6 Digest; fot at autox.team.net
> Betreff: [Fot] Help needed, TR250 engine rebuild oil pressure problems
> 
> Hello Triumph problem solvers.
> 
> I nearly have my TR250 ready for Triumphest/VTR after an engine rebuild.
> I'm trying to solve a problem now with maintaining consistent oil pressure.
> When I first ran the car after the rebuild, the 20 minutes at 2000 rpm
> start, I had Castrol 5W30 and ZDDP additive.  After the engine really got up
> to temperature, I had trouble with maintaining oil pressure, dropping way
> down close to zero at idle.  A mechanic friend of mine checked it out with
> me and with the rocker cover off, we saw little flow at the rockers at idle.
> I had an external oiling line on my shelf so I added that and saw very good
> flow at start up when oil pressure was about 65 and settled down to just
> under 50 as it started to get warm, but continued to drop to the same near
> zero level once it was at temperature.  
> 
> Today I changed the oil to 20W50 Castrol with Lucas ZDDP break-in additive.
> Same symptoms.  I drove the car about four miles near my house and at
> temperature, I was running at 20-25 psi when driving, dropping to near zero
> at stop signs.  When I arrived home, I removed the quite hot valve cover oil
> fill cap and started the car.  Very little oil was dancing around, if any,
> at idle.  I revved the car a bit and saw sufficient oil flowing and
> splattering in there.  
> 
> Now I don't know what to do.  I have the braided oil pressure line from TSI.
> I don't think my gauge is bad with oil flow symptoms consistent with the
> pressure readings.  Could the oil pressure regulator be an issue?  Mine is
> relatively new from BPNW.  I do have a second one I could swap in.  The oil
> pump was new with the rebuild.  
> 
> Any advice or guidance is appreciated.  
> 
> Andy Packard
> CD6746L
> President - Triumph Travelers
> Autocross Chair - 2013 Triumphest/VTR
> 
> 
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