ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Jan 23, 2019 17:56:50 GMT
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New spark plugs arrived today, so quick chucked them in - it started better, still missing but better than it has been. Left it on a fast idle while I went around checking things, manifold temps etc and then all of a sudden there was a strange whirring noise for about a second (a bit like the started engaged) followed by a clunk and the engine stopped dead Took the plugs out to check them and they're all ok, not fallen apart or anything. Tried turning the engine over with a bar on the crank bolt, it turned a little way but not very easily and then wouldn't go any further Not really sure what's gone on yet, I think whatever was failing and causing the misfire has maybe failed altogether.....
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Jan 23, 2019 18:06:09 GMT
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Oh no Hope it’s something silly!
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Jan 23, 2019 19:20:10 GMT
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unbolt starter motor to check it's not engaged on flywheel?
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Jan 23, 2019 19:26:13 GMT
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sounds expensive
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Jan 23, 2019 22:08:23 GMT
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Could be a broken ring that has jammed but as with any engine it could be anything. It's a good job you were not driving it.
That's a pity Chris.
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Last Edit: Jan 23, 2019 22:09:01 GMT by peteh1969
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ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Jan 25, 2019 19:08:49 GMT
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Think I have just been incredably lucky...... The day after 'The incident' I checked over the engine. With the plugs out, crank couldn't be turned clockwise,it would go anti-clockwise but after about 120/140 degrees it locked again, feels like it's piston/valve contact. Couldn't get the crank and cam timing marks round to TDC but looking at them in relation to were they were they didn't look like they'd line up. Cam timing marks were aligned with each other, just the crank was out. Took off the timing belt, reset marks and refitted belt, engine would now turn without a problem... However when turning it over, by hand, I realized there was a rubber spacer, from behind the cam cover, caught between the cam belt and crank pulley! Don't know whether it's been there for a while or just dropped in when taking off the timing belt. Makes sense that it could be the culprit, getting caught and letting the belt slip round the crank pulley until the pistons contacted with the valves Doesn't look that chewed for something that's been in a pulley at around 2000rpm but I guess it wasn't for long.... So today I put the new plugs back in and tried starting it, struck straight up as the other night, still missing but no worse and not sounding like any valve damage
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ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Jan 25, 2019 19:24:20 GMT
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Poor picture of the offending item....
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Jan 25, 2019 19:29:47 GMT
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very lucky if you didn't bend valves, go play lotto
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ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Jan 25, 2019 19:44:34 GMT
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very lucky if you didn't bend valves, go play lotto Thinking because of the cut-outs in the piston they hit the valves square on rather than on an edge which would have bent them.....
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Jan 25, 2019 22:09:08 GMT
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Have you bought a Lottery ticket for tomorrow Chris it seams the luck is with you.
Nice One
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Jan 25, 2019 22:33:27 GMT
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Very lucky.
It would have been a bit of a trauma for the belt, might be worth changing it.
Also it wouldn't be a bad idea to take the cam cover off and check the valve gear for damage (if it has rockers they can bend or crack).
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Jan 26, 2019 10:56:50 GMT
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They are standard pistons? If yes they are only little finger nail cutouts, so they still hit one edge of the valve cutout in this theoretical real life hypothesis
It happened with engine running, with enough force to stop engine dead.
Head off time
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Last Edit: Jan 26, 2019 11:00:07 GMT by darrenh
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ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Jan 28, 2019 19:50:21 GMT
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They're Omega forged pistons with big valve cut-outs.. Decided head really needs to come off just for peace of mind... Never know, might find the cause of the miss-fire while I'm at it. So far found nothing awry, cam caps are all intact and bolts tight, head studs are also all good.
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Jan 28, 2019 20:08:41 GMT
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Good move it would always nigle you if you did not just for piece of mind.
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Jan 28, 2019 22:42:27 GMT
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A compression test would save taking the head off surely?
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1967 Triumph Vitesse convertible (old friend) 1996 Audi A6 2.5 TDI Avant (still durability testing) 1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Jan 29, 2019 10:29:46 GMT
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I would've done the same to be fair at least you will have peace of mind
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ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Jan 30, 2019 19:31:27 GMT
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No photos as light had gone by the time I'd finished but head is off...
Quick inspection shows no damage to pistons, valves look good too but not had chance to turn the cams and check over them properly.
Head gasket looks to be intact too, so that's not the root of the misfire - was kind of hoping it might show something so I can get to the bottom of it....
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Jan 30, 2019 20:55:14 GMT
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Do the cylinder bores look in good condition Chris or will you do that when you check the cams?
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ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Do the cylinder bores look in good condition Chris or will you do that when you check the cams? Didn't look, I'll be checking it all over properly when I've got some better light to work by, but that'll not be for a few days now.
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ChrisT
Club Retro Rides Member
Posts: 1,670
Club RR Member Number: 225
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Last Edit: Feb 4, 2019 18:45:45 GMT by ChrisT
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