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Hi guys, I have recently been recommissioning a 1965 victor fb. The car had been starting and running fine after renewing ignition components. After getting it out onto the road for the first time ( first time under load) there was an instant problem with shuddering, no power unless the clutch was in . Almost like fuel starvation( it's not) . White grey smoke from exhaust .
I managed to get the car home labouring in 4th . A compression test shows 25psi in all cylinders ( compression ratio should be 120psi when new) I then squirted some oil in the bores and tested again which raised the compression to around 50 psi . So there is leakage past the rings but I'm more concerned about where the other 60psi is going . I was also puzzled to why it was even wear.
Could this be a cylinder head / valve problem ?
I think it should be a leaded cylinder head an my thoughts are the valves and seats are nackered with wrong fuel possibly? I've no history for the car. But I do know the mileage is genuine at 63,000 .
any thoughts or procedures to try would be welcome . But I'm sure the head needs to come off ....
Any my help out there?
Thanks m
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eternaloptimist
Posted a lot
Too many projects, not enough time or space...
Posts: 2,578
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I'd be amazed if it actually started with 25psi compression. Are you sure you're doing it right?
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XC70, VW split screen crew cab, Standard Ten
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Is there a wrong way ? All plugs out and then compression checking each cylinder ? It is however hardly running .
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eternaloptimist
Posted a lot
Too many projects, not enough time or space...
Posts: 2,578
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If it really only has 25psi compression, I'd pull the head off and have a look at what you find. Possibly head gasket failure, possibly valve seats in poor condition, possibly worn bores, rings etc. Presumably the valves are closing OK?
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XC70, VW split screen crew cab, Standard Ten
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Hi I've not checked to see if the valves are closing properly but I did adjust the tappets when I first got the car a couple of months back , there was a backfire through the carb originally which I pressumed were sticky valves , so I did an engine oil flush using the stp oil flush according to the instructions . Dropped That and the old oil added new oil and filter etc .
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eternaloptimist
Posted a lot
Too many projects, not enough time or space...
Posts: 2,578
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Pouring a pint of redex down the carb whilst the engine is on a fast tickover used tO be the way to fix sticking valves. Pop the rocker cover off and double check the valves are all closing fully. Has it been standing long?
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XC70, VW split screen crew cab, Standard Ten
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The car had been standing for a couple of years as far as I know but the car has had a couple of long standing periods of not being used during its 50 years . I'll carry out that check tomorrow , ideally I want to find something other than heavy engine wear . I was just confused at how each cylinder was showing the same compression which I thought would be more bottom end than the top end ......
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Check the valves, if they are closing wip the head off and have a look.
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v8ian
Posted a lot
Posts: 3,766
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You adjusted the tappets, Might be an Idea to back them off a bit, out of curiosity, what did you set them to, and hot or cold?  |
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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Jan 10, 2015 12:43:14 GMT
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Hi, as it has been idle for so long and then pressed into service again I would say it's the rings are stuck in their grooves. The best way apart from re-ringing is to partly fill the bores with diesel and leave them to soak for a couple of days at least. If you want to satisfy your doubts about the valves or head gasket, then remove the head, lap the valves in and change the head gasket. The longer you can leave the diesel in the bores the better, you will have to keep putting a bit more in frequently. Don't forget to change the oil, because of the diesel, before use. If you don't keep spinning the engine over the filter should be OK.
Colin
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mattrb
Part of things
Posts: 78 
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Jan 10, 2015 13:20:15 GMT
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Are you holding the throttle wide open with all the plugs out when doing the compression test?
Just removing one plug at a time and leaving the throttle closed will give some funny readings.
No way is 25psi credible IMHO. You must have something way out or be doing something wrong.
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Jan 10, 2015 13:28:48 GMT
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Aren't they the engine you have to adjust tappets on with it hot and running while you set them? 25psi does seem very low to have that on all cylinders and it still to run as has been said previously
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Jan 10, 2015 13:35:48 GMT
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Are you holding the throttle wide open with all the plugs out when doing the compression test? Just removing one plug at a time and leaving the throttle closed will give some funny readings. No way is 25psi credible IMHO. You must have something way out or be doing something wrong. Agreed. |
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mattrb
Part of things
Posts: 78
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Jan 10, 2015 14:03:33 GMT
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Also check that you are getting full throttle at full pedal depression and that the cable hasn't stretched or been poorly adjusted.
If you've tried all this and are still getting odd results you should try another gauge before anything drastic. The tapered, stuff in spark plug hole type gauges are rubbish. You want the ones with a thread and o-ring.
Get an assistant to help. It's dead easy with two. So tricky on your own.
Best of luck.
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Jan 10, 2015 20:59:05 GMT
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I feel a it stupid , before I went to strip things to investigate I nipped up to screw fix and bought another compression tester , it now has 120psi ! It turned out to be a problem with the ignition . It was firing on all cylinders at idle and under load only 2 and 4 were continuing to spark . The points seem to have been sticking or welding them selfs . It's now re timed AND new points and it seems to be running well on the road except from a flat spot when pulling away from junctions . Thanks for all the help and sorry to waste people's time , but I will remember all the above info many thanks
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eternaloptimist
Posted a lot
Too many projects, not enough time or space...
Posts: 2,578
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Jan 10, 2015 21:04:28 GMT
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Good outcome.
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XC70, VW split screen crew cab, Standard Ten
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mattrb
Part of things
Posts: 78
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Jan 10, 2015 21:12:19 GMT
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I feel a it stupid , before I went to strip things to investigate I nipped up to screw fix and bought another compression tester , it now has 120psi ! It turned out to be a problem with the ignition . It was firing on all cylinders at idle and under load only 2 and 4 were continuing to spark . The points seem to have been sticking or welding them selfs . It's now re timed AND new points and it seems to be running well on the road except from a flat spot when pulling away from junctions . Thanks for all the help and sorry to waste people's time , but I will remember all the above info many thanks You haven't 'wasted' my time that's for sure. I'm just glad to have been part of the help. I know other posters will feel the same. I knew it would be something daft. I'd save up for an electronic ignition and junk the points before too long though; they're for total purists only if you ask me. Well done on the successful outcome and thanks for following up. |
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Jan 10, 2015 22:35:59 GMT
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I feel a it stupid , before I went to strip things to investigate I nipped up to screw fix and bought another compression tester , it now has 120psi ! It turned out to be a problem with the ignition . It was firing on all cylinders at idle and under load only 2 and 4 were continuing to spark . The points seem to have been sticking or welding them selfs . It's now re timed AND new points and it seems to be running well on the road except from a flat spot when pulling away from junctions . Thanks for all the help and sorry to waste people's time , but I will remember all the above info many thanks You haven't 'wasted' my time that's for sure. I'm just glad to have been part of the help. I know other posters will feel the same. I knew it would be something daft. I'd save up for an electronic ignition and junk the points before too long though; they're for total purists only if you ask me. Well done on the successful outcome and thanks for following up. Agreed. (Again)  |
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a3ltr
Part of things
Posts: 33
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Jan 10, 2015 23:02:05 GMT
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Last Edit: Jan 10, 2015 23:03:21 GMT by a3ltr
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ChasR
RR Helper
motivation
Posts: 10,195
Club RR Member Number: 170
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Jan 10, 2015 23:36:37 GMT
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Modern point seem to be made of an inferior quality these days. On that basis alone I would attempt to go for an electronic conversion if you can  . |
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