Jump to content


Photo

Update on my PI issues

tr6

  • Please log in to reply
38 replies to this topic

#1 iani

iani
  • TR Register Members
  • 157 posts
  • Location:Corby, Northamptonshire
  • Cars Owned::'69 TR6

Posted 14 July 2018 - 05:20 PM

As I've been posting, I have had trouble with my car ever since a Garage fitted an engine and reconditioned PI kit. Thanks to the tremendous advice I have received on here, I got to the point where my car would idle at 950 RPM cold and around 1050 RPM hot, after blipping the throttle to get it to drop a bit! I then borrowed an inlet manifold setting tool, on trying to fit this, it was apparent that the three manifolds are not aligned at all well, I sent photographic evidence to the garage and my car is now back with them and they will refit the system once again.

 

Unfortunately, on stopping the car at their premises, the cooling system pressurised, it did the same yesterday, I now suspect the HG is on its way out, more expense. On the plus side, I have the head from my original engine and can use that in exchange, it also means I can junk the external oil feed I currently have to use to get round a blocked oilway. Now I just have to find a stage 2 head that's available in a reasonable timeframe.

 

Thanks to all of you who have given me advice with my problems thus far.

 

Ian


  • 0

#2 DaveN

DaveN
  • TR Register Members
  • 752 posts
  • Location:Langley Berks
  • Cars Owned::TR6 cr chassis....one of the last ones!!

Posted 14 July 2018 - 06:03 PM

What makes you think the HG is on its way out? The cooling system may just need a good flush. Do you have an engine driven fan or electric? What rad cap is fitted? Thermostat?
Simple things first!!
  • 0

#3 iani

iani
  • TR Register Members
  • 157 posts
  • Location:Corby, Northamptonshire
  • Cars Owned::'69 TR6

Posted 14 July 2018 - 06:43 PM

What makes you think the HG is on its way out? The cooling system may just need a good flush. Do you have an engine driven fan or electric? What rad cap is fitted? Thermostat?
Simple things first!!

Correct & new 7lbs cap

I flushed the system last week

I have a revotec puller fan fitted which is working correctly

I have an 82C 'stat which appears to be working correctly

 

On the road, the temperature gauge sits below half way, the electric fan rarely comes on, certainly not when moving. On shutting the engine down, the coolant rushes back into the radiator after a few mins, overflows into the bottle and then spits out due to the bottle capacity being exceeded. This is a new development, I haven't had this issue previously.

 

Ian


  • 0

#4 DaveN

DaveN
  • TR Register Members
  • 752 posts
  • Location:Langley Berks
  • Cars Owned::TR6 cr chassis....one of the last ones!!

Posted 14 July 2018 - 09:04 PM

Ok with it cold remove the cap and fill the rad refit the cap then empty the bottle and just put in say about a quarter pint and try that.
One other thing you say it’s been flushed did you remove the block drain and rake it out?i poked the pressure washer in there!
I also disconnected the rad hoes from the heater valve and back flushed it with mains water pressure..... leave the rad cap off for those items though!

Dave
  • 0

#5 DaveN

DaveN
  • TR Register Members
  • 752 posts
  • Location:Langley Berks
  • Cars Owned::TR6 cr chassis....one of the last ones!!

Posted 14 July 2018 - 10:38 PM

Couple of other things....not sure if it’s been mentioned already is the ignition timing correct? And fan belt adjustment?
Is the rad cap correct in that it vents coolant into the bottle and as the ngine cools it draws it back in. So the cap should have two seals.
  • 0

#6 Tim D.

Tim D.
  • TR Register Members
  • 1,274 posts
  • Location:Kenilworth
  • Cars Owned::Current:
    1972 Triumph TR6
    1970 MG Midget Speedwell
    2005 Peugeot 307 CC
    Previous:
    1997 Peugeot 106D (Slowest car in the world!)
    1976 Triumph Spitfire 1500
    1972 Lotus Elan +2S130
    1985 VW Golf 1.3
    1980 BL Metro 1.1

Posted 15 July 2018 - 07:23 AM

Hi Ian,
Had the exact same behavour and sadly it was a HGF.
Tim
  • 0

Lover of old cars and old cars racing


#7 Waldi

Waldi
  • TR Register Members
  • 862 posts
  • Location:Hellevoetsluis, Netherlands
  • Cars Owned::AR Spider Duetto, TR6, Moris Minor Traveller, MGB GT, XK140FHC, Healey MK2, TR6-PI (CP, 1970)

Posted 15 July 2018 - 08:02 AM

Ian,
is the thermostat installed with the spring facing downwards? It fits both ways, should be with spring facing down.
Apologies for asking, if so, just smile about this comment.
Waldi
  • 0

#8 iani

iani
  • TR Register Members
  • 157 posts
  • Location:Corby, Northamptonshire
  • Cars Owned::'69 TR6

Posted 15 July 2018 - 02:26 PM

Ok with it cold remove the cap and fill the rad refit the cap then empty the bottle and just put in say about a quarter pint and try that.
One other thing you say it’s been flushed did you remove the block drain and rake it out?i poked the pressure washer in there!
I also disconnected the rad hoes from the heater valve and back flushed it with mains water pressure..... leave the rad cap off for those items though!

Dave

The block drain is blocked solid, no amount of prodding had any effect whatsoever, the car has just started dumping coolant though, it wasn't doing this before.


  • 0

#9 iani

iani
  • TR Register Members
  • 157 posts
  • Location:Corby, Northamptonshire
  • Cars Owned::'69 TR6

Posted 15 July 2018 - 02:27 PM

Couple of other things....not sure if it’s been mentioned already is the ignition timing correct? And fan belt adjustment?
Is the rad cap correct in that it vents coolant into the bottle and as the ngine cools it draws it back in. So the cap should have two seals.

The cap has two seals Dave, it's a reasonably new one from Moss. The fan belt seems fine to me.


  • 0

#10 iani

iani
  • TR Register Members
  • 157 posts
  • Location:Corby, Northamptonshire
  • Cars Owned::'69 TR6

Posted 15 July 2018 - 02:28 PM

Ian,
is the thermostat installed with the spring facing downwards? It fits both ways, should be with spring facing down.
Apologies for asking, if so, just smile about this comment.
Waldi

I'm smiling Waldi  :D


  • 0

#11 iani

iani
  • TR Register Members
  • 157 posts
  • Location:Corby, Northamptonshire
  • Cars Owned::'69 TR6

Posted 15 July 2018 - 02:30 PM

Hi Ian,
Had the exact same behavour and sadly it was a HGF.
Tim

Thanks Tim, the last time I changed a head must have been in the early 90's, having been quoted 10hrs labour I guess I'll be doing it again soon enough.


  • 0

#12 Mike C

Mike C
  • Registered User
  • 493 posts
  • Location:Melbourne Australia

Posted 15 July 2018 - 04:16 PM

I hope Waldi's right. My cylinder head is pretty much irreplaceable, having been developed with the car over the past 50 odd years , so I'd be very reluctant to replace it.

 

If you still suspect a blown head gasket have you tried something like this to confirm it:

 

https://www.google.c...SkIm58jdlrdiFMo


  • 0

#13 peejay4A

peejay4A
  • TR Register Members
  • 7,551 posts
  • Location:Warwickshire
  • Cars Owned::TR4A (Eric) current
    TR6 (CP) gone
    TR4 (frying tonight) long gone

Posted 15 July 2018 - 05:35 PM

Isn't it a 13lb cap on the TR6?


  • 0
Pete 

#14 TR NIALL

TR NIALL

    Niall Callery

  • TR Register Members
  • 4,496 posts
  • Location:Dublin,Ireland.

Posted 15 July 2018 - 06:37 PM

Isn't it a 13lb cap on the TR6?


Yes,we’ll mine is.
  • 0

#15 peejay4A

peejay4A
  • TR Register Members
  • 7,551 posts
  • Location:Warwickshire
  • Cars Owned::TR4A (Eric) current
    TR6 (CP) gone
    TR4 (frying tonight) long gone

Posted 15 July 2018 - 06:56 PM

Thought so. A 7lb cap has caused boil ups on TR6s in other threads.
  • 0
Pete 

#16 lightningburns

lightningburns
  • TR Register Members
  • 73 posts

Posted 15 July 2018 - 07:06 PM

I think you will find that 7lb early TR6 to 72, CP75000?, GRC112.  13lb late, GRC114, yes the 13lb will raise the boiling point slightly and are often retro fitted anyway, but it should not boil over with a 7lb.

Having said that it would raise the boiling point by about 15 degrees F, so if it was me I would put on a 13lb cap and see if it cures it, well worth the expense !

 

Regards,

 

John


Edited by lightningburns, 15 July 2018 - 07:13 PM.

  • 0

#17 Nick Jones

Nick Jones
  • Registered User
  • 829 posts

Posted 16 July 2018 - 09:07 AM

"Boiling up" or increased cooling system pressure after switching off is unlikely to be HGF.  Pressurisation due to HGF is caused by combustion pressure leaking past the gasket into the cooling passages - and if the engine isn't running then there is no combustion pressure.

 

What it actually is is the residual heat in the head causing the now stationary water in the water jacket to boil in a few hot spots (likely around the combustion chambers) and this is causing the pressure rise and water dumping.

 

Why now?  Well, the hot weather/high ambient won't be helping but from the description of you PI running issues it seems highly likely that the butterflies are not well balanced, so some cylinders may be running quite lean and thus hotter than usual.

 

Higher pressure cap may be enough to mask the symptoms.  Some water being pushed into the overflow bottle in these conditions is quite normal though and it should be sucked back on cooling provided the correct double-seal rad cap is fitted.

 

Nick


  • 1

#18 saffrontr

saffrontr
  • TR Register Members
  • 750 posts
  • Location:Lancashire

Posted 16 July 2018 - 09:40 AM

According to the Triumph service instruction sheets and Dealer newsletters all Triumphs were fitted with a 13lb radiator cap from late 1968 / early 1969

 

Derek


  • 0

#19 oldtuckunder

oldtuckunder
  • TR Register Members
  • 1,192 posts

Posted 16 July 2018 - 09:51 AM

Probably isn't but a little thing also worth checking is if you really have filled the system and excluded all the air. Its very easy to leave a large pocket of air when filling which can cause a similar hot pressure burst, then you refill but still don't exclude all the air, and the same thing happens, and then your sure its something major.........

 

Alan


  • 0

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

 

Still no warning points!  :rolleyes:


#20 iani

iani
  • TR Register Members
  • 157 posts
  • Location:Corby, Northamptonshire
  • Cars Owned::'69 TR6

Posted 16 July 2018 - 10:01 AM

I’ll stick a 13lb cap on and see if there is any improvement, hopefully the butterflies will be balanced when I get the car back on Saturday.

Ian
  • 0





Also tagged with one or more of these keywords: tr6

2 user(s) are reading this topic

0 members, 2 guests, 0 anonymous users