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Matt306
October 7, 2017, 4:16pm Report to Moderator

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My little four pot (which i will swap out for a six cylinder sometime next year/year after/maybe year after that) seems to have developed a little lack of power.

I have done the tappets to get a little stiff pull on the tappets when feeding in 10thou feeler and pulling back.

I did a cold pressure test and got 150/90/150/150 psi on the pistons. I know its meant to be done warm so went for a drive and run again and the offending chamber has now risen to 100 psi.

Not noticing any coolant leak but would like to sort the problem. Most obvious is remove the head and have a look but is there anything i can look at prior to that


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Nick Jones
October 7, 2017, 5:04pm Report to Moderator

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the 150 psi is probably about right for the engine.

Do a wet compression test next.  That is, put a tablespoonful of oil in each cylinder and repeat the test.  This oil provides additional ring sealing and helps determine whether you have a ring/bore issue or valve seating issue.  If it's a ring leak, adding the oil will give a bigger improvement than a valve issue.

Hopefully it's a poorly seating valve and fairly easy and cheap to resolve.

Leak down test is another option but involves slightly more elaborate equipment.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
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RedRooster
October 7, 2017, 6:34pm Report to Moderator


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Check your water for oil & check your oil for water, if you can find some one with a block leak tester try that.


GT6 Mk3, the Rooster    https://www.youtube.com/watch?v=u8W1XSjFB6g  tune on the radio the first time it broke down, 5 miles after i bought it
http://www.triumph-club-de-fra.....estauration-dune-gt6  
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RedRooster
October 7, 2017, 6:34pm Report to Moderator


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Check your water for oil & check your oil for water, if you can find some one with a block leak tester try that.



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GT6 Mk3, the Rooster    https://www.youtube.com/watch?v=u8W1XSjFB6g  tune on the radio the first time it broke down, 5 miles after i bought it
http://www.triumph-club-de-fra.....estauration-dune-gt6  
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Matt306
October 7, 2017, 7:10pm Report to Moderator

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I'll stick some transmission oil down piston two and try that.
I had the sump off and the checked the rad, no sign of fluids being in the wrong place.


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Nick Jones
October 7, 2017, 9:04pm Report to Moderator

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Most likely the exhaust valve seat IMO.  That much compression missing going into the water jacket would cause a header tank like a jacuzzi and water everywhere.....

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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TedTaylor
October 7, 2017, 11:09pm Report to Moderator

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Quoted from RedRooster
If you can find some one with a block leak tester try that.


Yep in the Forest of Dean

Not used it for 20 years and not sure about the fluid but could check that - it is only universal indicator liquid to test for pH (acidity/alkalinity)

MUT


Mad Uncle Ted!
Growing old is inevitable but growing up is optional.

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Matt306
October 8, 2017, 3:10pm Report to Moderator

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Cheers all.
But some ep90 down the bored and all the compressions rose. From 150 to 250 or over on 1,3 and 4. Number 2 went up from 90 to 150 so a smaller rise so I am thinking valve stuck. I had the stems and new valves about 4000 miles ago . I guess it's head off time to grind in valve or is there an easier way. Or is my thinking to cock?


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Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE

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JohnD
October 8, 2017, 3:59pm Report to Moderator


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Thats misinterpreting the results.
Any rise = no valve problem
Only if the pressure does not rise can you diagnose a stuck or damaged valve.
The first will be obvious, running the engine with the valve cover off.

The reason why compression down on 2 isnt obvious.   Your numbers are so high compared to those usually got that I suspect a very sensitive gauge, so the absolute pressure in 2 may be so low as to suspect faulty piston or rings.
John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
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Matt306
October 8, 2017, 4:11pm Report to Moderator

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Either way it's head off time I guess? Going to up load a video to YouTube with her running see if u hear what I hear.


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE

Triumph 1000cc 1991 Daytona First restoration much fun not much body work
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Matt306
October 8, 2017, 4:14pm Report to Moderator

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Here's the you tube video.

https://youtu.be/zJaOxvrWlzw


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE

Triumph 1000cc 1991 Daytona First restoration much fun not much body work
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Matt306
October 8, 2017, 4:34pm Report to Moderator

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Couple more... Looking at the white smoke I am erring too piston ring. Which is blooming annoying as I only took the sump off two weeks ago.
https://youtu.be/8oKBVI5rjOU
https://youtu.be/Wk-AaGNxrJ8


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE

Triumph 1000cc 1991 Daytona First restoration much fun not much body work
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poppyman
October 8, 2017, 5:32pm Report to Moderator
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Sadly it does look like oil smoke
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daver clasper
October 8, 2017, 7:24pm Report to Moderator
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Hi

Are compression dry/wet tests a fool proof way of diagnosing ring/piston/bore or head wear or a good starting point, please.

Thanks, Dave  
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Nick Jones
October 8, 2017, 7:26pm Report to Moderator

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Good starting point.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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