Loss of power and general unpleasantness...
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- Minor Legend
- Posts: 1033
- Joined: Tue Feb 12, 2002 12:00 am
- Location: Hallow, Worcestershire
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Right, I've checked the firing, and she's not firing on no.3 cylinder. Leads are OK. Going to have a look at the dizzy cap and the no.3 plug. Last time (when I lost a chunk of a valve on no.3... ) I was able to jolly her along for a bit, but the plug was coming out very wet. Didn't notice it last night, but that may be the case now, as I've not long got home...
Happy Minoring!
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
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- Minor Legend
- Posts: 1033
- Joined: Tue Feb 12, 2002 12:00 am
- Location: Hallow, Worcestershire
- MMOC Member: Yes
Okay, plug no.3 is soaking. Dizzy cap is fine (swapped with an old one). Tried a clean plug in no.3 and she still wouldn't fire on that cylinder. Am I right in assuming that this would indicate a problem with the inlet valve, i.e. that with a spark present (which there is) and petrol present (enter first witness, a damp plug ) that there must be an absence of air?
Thanks for all the help so far, chaps!
Thanks for all the help so far, chaps!
Happy Minoring!
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Mind you - with an exhaust valve problem the plug will still fire - it just won't be doing much good. It could be rings/piston problem - but usually that gives cloud of blue smoke. If it is a head gasket 'slightly blown - you can be sure it will not heal up ! It's going to get worse - and may damage the head/block too if you keep running it.
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- Minor Legend
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Odds on its a burnt valve, off with the head and find out! ;)
Cheers John - all comments IMHO
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- Come to this years Kent branches Hop rally! http://www.kenthop.co.uk
(check out the East Kent branch website http://www.ekmm.co.uk )
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- Minor Fan
- Posts: 245
- Joined: Sat Aug 31, 2002 11:29 pm
- Location: Leyton (East London)
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I got a compression tester from Lloyds motor spares for £8 earlier in the year. Its another tool that everybody should have
"The answer to the Ultimate Question... Of Life, the Universe and Everything..." said Deep Thought. "Is..." said Deep Thought, and paused. "Is... Forty-two," said Deep Thought.
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- Minor Legend
- Posts: 1033
- Joined: Tue Feb 12, 2002 12:00 am
- Location: Hallow, Worcestershire
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The plug's wet with petrol. I've been given a tip about a quick compression test - use a cork (not the traditional cork, but the reconstituted plastic ones as they don't flake off, possibly causing damage). If it pops out when turning the engine, there's compression. Trust me - there IS compression. Took me ages to find the cork again after it bounced off the walls a couple of times...
Happy Minoring!
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
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- Moderator
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- Location: LEAMINGTON SPA
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Wet with petrol might be something simple like electrics / bad plug (hopefully) but can also be fouled up due to oil.
When the plug is fouled it then gets wet with ptrol as the petrol doesn't get burned.
I was going to suggest using the starting handle and your finger over the plug hole, but the cork test sounds much more amusing!
When the plug is fouled it then gets wet with ptrol as the petrol doesn't get burned.
I was going to suggest using the starting handle and your finger over the plug hole, but the cork test sounds much more amusing!
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- Minor Legend
- Posts: 1033
- Joined: Tue Feb 12, 2002 12:00 am
- Location: Hallow, Worcestershire
- MMOC Member: Yes
Right - an update.
We have:
We have:
- spark (changed leads and plugs, used colourtune on her),
- combustion (as shown by colourtune - bright blue flame, going to yellow when revved),
- compression (cork-test),
- slightly smoky exhaust (wasn't running engine for long - most smoke generated with choke out).
Happy Minoring!
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
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- Moderator
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something fairly serious then (Valve, gasket, rings, piston...)It's almost as though there's compression on the upstroke, but the downstroke is creating insufficient power.
It really is time for a compression test with a guage/gauge!
Ray. MMOC#47368. Forum moderator.
Jan 06: The Minor SII Africa adventure: http://www.minor-detour.com
Oct 06: back from Dresden with my Trabant 601 Kombi
Jan 07: back from a month thru North Africa (via Timbuktu) in a S3 Landy
June 07 - back from Zwickau Trabi Treffen
Aug 07 & Aug 08 - back from the Lands End to Orkney in 71 pickup
Sept 2010 - finally gave up breaking down in a SII Landy...
where to break down next?
2013... managed to seize my 1275 just by driving it round the block
Jan 06: The Minor SII Africa adventure: http://www.minor-detour.com
Oct 06: back from Dresden with my Trabant 601 Kombi
Jan 07: back from a month thru North Africa (via Timbuktu) in a S3 Landy
June 07 - back from Zwickau Trabi Treffen
Aug 07 & Aug 08 - back from the Lands End to Orkney in 71 pickup
Sept 2010 - finally gave up breaking down in a SII Landy...
where to break down next?
2013... managed to seize my 1275 just by driving it round the block
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- Minor Legend
- Posts: 1033
- Joined: Tue Feb 12, 2002 12:00 am
- Location: Hallow, Worcestershire
- MMOC Member: Yes
Took Phyllis up to the Moggy Factory today, and they did a compression test: 110, 100, 20, 100. There was sufficient on no.3 to blow the cork out (though I could have pushed it in a bit tighter, I suppose) but as the readings show, it was well down.
Took the head off, and sure enough the exhaust valve for No.3 cylinder was chipped. They swapped the valve for another one, and she's purring happily again. Hoorah!
Took the head off, and sure enough the exhaust valve for No.3 cylinder was chipped. They swapped the valve for another one, and she's purring happily again. Hoorah!
Happy Minoring!
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
Phyllis ~ 1962 Morris Minor 4 Door Deluxe
Black coachwork with Red Duo-Tone Upholstery
You must have been able to feel this on the starting handle ! But the readings at 100/110 are miserable too - either all the valves are leaking - or the rings/bores are badly worn. You should get 160 psi compression on a healthy engine. Surely when the head was off anyway - they ground in ALL the valves ? Did they do another compression test at the end of the work ?