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1973 Cortina van

will Posted a lot Posts: 4,023	1973 Cortina van will @familybanger
	Aug 23, 2010 2:45:17 GMT Select Post Deselect Post Link to Post Back to Top
	Pooluck Mark Still, maybe stepping back is a good move at this point in time with the added bonus of having that FB metal to fettle in the mean time. Curious as to what has lost the compression, though sure the story will unfold in time. Chin up mate


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PhoenixCapri West Midlands Posts: 2,685 Club RR Member Number: 91	1973 Cortina van PhoenixCapri @phoenixescort Club Retro Rides Member 91
	Aug 24, 2010 10:37:26 GMT Select Post Deselect Post Link to Post Back to Top
	Really sorry to hear that Mark, but sometimes being forced to stop a project for a while can be the best thing for it, and I'm certain with you involved when this does get sorted it'll be even better than any of us here think it's going to be ;D Hope you have better luck on the next job/project/idea etc.
	Capri Mk1 Toledo Estelle Eagle Jeep Capri Mk2 E-type Rep Chevette Escort Mk2 Superminx CRX

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Deleted Posts: 0	1973 Cortina van Deleted @Deleted
	Sept 10, 2010 20:47:32 GMT Select Post Deselect Post Link to Post Back to Top
	ran a leak down test on the van this morning and it revealed that the loss of compression is down to crank case pressure ie leaking past the rings blast that means the engines gotta come out . won't know whats gone on with them til i get it stripped but at least i now know why it has no compression and why it ain't running


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petetong Part of things Posts: 736	1973 Cortina van petetong @petetong
	Sept 10, 2010 21:53:13 GMT Select Post Deselect Post Link to Post Back to Top
	stick with it.. will come right in the end.... and it will all have been worth it when it does.


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retromk11 Part of things Posts: 187	1973 Cortina van retromk11 @retromk11
	Sept 14, 2010 12:24:24 GMT Select Post Deselect Post Link to Post Back to Top
	which way were the splits on the rings lined up on the pistons? as if there all in line you will get "leak down" the bores


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retromk11 Part of things Posts: 187	1973 Cortina van retromk11 @retromk11
	Sept 14, 2010 14:23:04 GMT Select Post Deselect Post Link to Post Back to Top
	also check valve clearances!


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Deleted Posts: 0	1973 Cortina van Deleted @Deleted
	Sept 14, 2010 16:44:52 GMT Select Post Deselect Post Link to Post Back to Top
	Sept 14, 2010 12:24:24 GMT retromk11 said: which way were the splits on the rings lined up on the pistons? as if there all in line you will get "leak down" the bores all the rings were set correctly with the gaps 120 degrees apart i'll find out when I pull the motor weather its some how moved or not engine was built for nitrous so has a slightly lager than stock gap but it shouldn't have made any difference to the compression Sept 14, 2010 14:23:04 GMT retromk11 said: also check valve clearances! checked that many times even tried winding them right off
	Last Edit: Sept 14, 2010 16:50:41 GMT by Deleted

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retromk11 Part of things Posts: 187	1973 Cortina van retromk11 @retromk11
	Sept 16, 2010 9:16:41 GMT Select Post Deselect Post Link to Post Back to Top
	ahh sounds like its built right then cant think what else it would be. what about an air line in the plug hole and temp block off the crankcase breather to try and blow the rings open? (done with caution)


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Deleted Posts: 0	1973 Cortina van Deleted @Deleted
	Sept 19, 2010 22:08:56 GMT Select Post Deselect Post Link to Post Back to Top
	got the mk3 back down the workshop this weekend to investigate what has happened to the compression . on removing the engine I pulled the heads off and immediately noticed that all was not right with the engine all of the exhaust valves had at some point made contact with the pistons this rang some alarm bells so a full strip down followed and the root cause of this was soon found on removing the camshaft . a broken camshaft dowel has caused the timing to move resulting in the contact with the pistons luckily there appears to be no damage to the valves however the pistons do have a I little damage to the skirts which in turn have caused a small amount of scoring to the bores so some work will be needed there but at least I now know what caused all the trouble with the engine now all i need to do is fix it and put it back together
	Last Edit: Sept 19, 2010 22:13:40 GMT by Deleted

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Thrasher Posted a lot Posts: 2,675	1973 Cortina van Thrasher @thrasher
	Sept 19, 2010 22:31:37 GMT Select Post Deselect Post Link to Post Back to Top
	Wow, wouldn't have even guessed that mate. How bad is the bore damage really !? At least you know now I suppose ( finally !!! )


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Deleted Posts: 0	1973 Cortina van Deleted @Deleted
	Sept 19, 2010 22:57:48 GMT Select Post Deselect Post Link to Post Back to Top
	Sept 19, 2010 22:31:37 GMT Thrasher said: Wow, wouldn't have even guessed that mate. How bad is the bore damage really !? At least you know now I suppose ( finally !!! ) its going to need a hone but in general both the pistons and bores are ok just a bit of light rubbing where its crashed with the valves really. i'm going to re ring the pstons to be on the safe side any way though


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PhoenixCapri West Midlands Posts: 2,685 Club RR Member Number: 91	1973 Cortina van PhoenixCapri @phoenixescort Club Retro Rides Member 91
	Sept 20, 2010 8:37:12 GMT Select Post Deselect Post Link to Post Back to Top
	Well I never would have guess that for the cause! Might be worth going to a double dowl or something next time? Or do you think it was just a bad dowl? Whatever, at least you can put it all back together now
	Capri Mk1 Toledo Estelle Eagle Jeep Capri Mk2 E-type Rep Chevette Escort Mk2 Superminx CRX

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Oldbus Posted hell of a lot If it won´t go force it.......if it breaks, it needed fixing anyway! Posts: 6,352	1973 Cortina van Oldbus @oldbus64
	Sept 20, 2010 10:07:12 GMT Select Post Deselect Post Link to Post Back to Top
	Glad you´ve got it sorted mate ;D


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jrevillug Posted a lot Posts: 3,520	1973 Cortina van jrevillug @jrevillug
	Sept 20, 2010 10:58:36 GMT Select Post Deselect Post Link to Post Back to Top
	Glad you know what it is, anyway, and I hope that you can get it sorted without too much hassle. I don't know about this engine, but I'm under the impression that dowels on gears like that are mostly for location - friction between the camshaft and the gear is what transmits most of the force. Is it possible that the gear and the cam don't line up quite properly, or that the securing bolt wasn't quite tight enough?
	Caution: As the buoys marking the shoals are often out of position, mariners are cautioned to be on their guard when navigating these shores 75 Imp 72 Clan - What? An update? Never!

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PhoenixCapri West Midlands Posts: 2,685 Club RR Member Number: 91	1973 Cortina van PhoenixCapri @phoenixescort Club Retro Rides Member 91
	Sept 20, 2010 13:42:13 GMT Select Post Deselect Post Link to Post Back to Top
	Very good point, it shouldn't take any force really, might be worth checking that the dowel isn't too long actually - if it was a touch long and stopped the two surfaces touching, it would take the full drive force and would snap just like it has. It would be a nice explanation of a very odd failure.
	Capri Mk1 Toledo Estelle Eagle Jeep Capri Mk2 E-type Rep Chevette Escort Mk2 Superminx CRX

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Deleted Posts: 0	1973 Cortina van Deleted @Deleted
	Sept 20, 2010 20:36:06 GMT Select Post Deselect Post Link to Post Back to Top
	Sept 20, 2010 13:42:13 GMT PhoenixCapri said: Very good point, it shouldn't take any force really, might be worth checking that the dowel isn't too long actually - if it was a touch long and stopped the two surfaces touching, it would take the full drive force and would snap just like it has. It would be a nice explanation of a very odd failure. on inspection it looks as if the bolt thread has failed as the shoulders of the threads are very rounded bolt incidentally is the only non ARP bolt on the entire engine


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BiAS Club Retro Rides Member Insert witty comment here Posts: 2,231 Club RR Member Number: 147	1973 Cortina van BiAS @cheeqi Club Retro Rides Member 147
	Sept 20, 2010 22:13:40 GMT Select Post Deselect Post Link to Post Back to Top
	That's astoundingly bad luck Mark, I'd have never expected that to be the reason. At least you know now. Do ARP do one of them?
	(car+wheels)-rideheight=WIN

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Deleted Posts: 0	1973 Cortina van Deleted @Deleted
	Sept 20, 2010 22:57:55 GMT Select Post Deselect Post Link to Post Back to Top
	Sept 20, 2010 22:13:40 GMT BiAS said: That's astoundingly bad luck Mark, I'd have never expected that to be the reason. At least you know now. Do ARP do one of them? yep just been looking at all the repair parts will get them ordered in the next few days along with a new keyway for the crank as that also has a crack running the length of it


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retromk11 Part of things Posts: 187	1973 Cortina van retromk11 @retromk11
	Oct 14, 2010 12:08:20 GMT Select Post Deselect Post Link to Post Back to Top
	gald youve found the problem, but gutted on what the problem is all teh best with getting it up and running again


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v8lee Posted a lot FoMoCoMoFo Posts: 1,045	1973 Cortina van v8lee @v8lee
	Oct 16, 2010 9:19:51 GMT Select Post Deselect Post Link to Post Back to Top
	Are the valves OK? Those little f*ckers can bend quite easily!
	No more old cars

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