CVH ignition timing help!

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MartinSS1
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CVH ignition timing help!

Post by MartinSS1 » Wed May 15, 2019 9:17 pm

So the car is finally back together. MOT booked for Friday. Seemed over advanced when cranking so I stuck the timing light on it. 34 degrees on idle!

I don't have enough adjustment in the distributer to get back to the correct spec for idle. Double checked the cam belt. Crank and cam bang on the timing marks.

Anybody else had this issue? Seized advance weights maybe? Bosh distributer 1.6 CVH.



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CVH ignition timing help!

Post by philhoward » Wed May 15, 2019 9:21 pm

Is that with the vacuum advance disconnected? Either way, the dizzy doesn’t sound in the rudest of health. Sticky advance mechanism is something they suffered when the Escort was new in the 1980’s..


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MartinSS1
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CVH ignition timing help!

Post by MartinSS1 » Wed May 15, 2019 9:42 pm

Yes, that's with vacuum off. Guess I'll be stripping that down then. MOT on Friday, no pressure!



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Roger Pennington
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CVH ignition timing help!

Post by Roger Pennington » Wed May 15, 2019 9:56 pm

You should be seeing the centrifugal advance varying with revs, If it doesn't then it's probably stuck. Your description does sound like that, and that's something I had with mine when I first got it - the advance was completely seized (mine is a motorcraft dizzy though).


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MartinSS1
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CVH ignition timing help!

Post by MartinSS1 » Thu May 16, 2019 5:55 am

Well I took the dizzy off. Removed the vacuum advance to get at the advance weights. All free. Cleaned it all up and put it back on. I can get 11 degrees at idle on full adjustment. It will do for now, but it can't be right. Also oil is leaking through the dizzy and into the cap.

Anyone got a spare Bosch one for sale?



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CVH ignition timing help!

Post by MadMax » Thu May 16, 2019 7:17 am

Bought as recon
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CVH ignition timing help!

Post by Jhdelta » Thu May 16, 2019 8:08 pm

From memory mine was the same took it off and turned it 180 and and swapped the plug leads round to suit and it adjusted easy to 12 btdc



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CVH ignition timing help!

Post by scimjim » Thu May 16, 2019 9:00 pm

You can’t turn the CVH dizzy through 180 deg, the cam drive key is offset. If you can’t get enough adjustment and there’s nothing wrong with the dizzy, the only 2 things I can think re that the crank mark is in the wrong place or the cam timing is out.


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CVH ignition timing help!

Post by Jhdelta » Thu May 16, 2019 9:28 pm

I think i took it off and turned the shaft (or possibly crank) so no4 post then became no1 and so on, it was running fine before hand but couldnt dail in anymore than about 8 btdc, like i say im trying to remember back to last year



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CVH ignition timing help!

Post by Roger Pennington » Fri May 17, 2019 12:16 am

If you turned the body of the dizzy by 180deg (leaving the shaft in the same place), then presumably (assuming you had a three-bolt dizzy like the OP) the third fixing lug became superfluous and was no longer used? So I wonder if it's possible that the third mounting bolt might be restricting the travel of the dizzy?
In my case, mine is a later 2-bolt dizzy.


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MartinSS1
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CVH ignition timing help!

Post by MartinSS1 » Sat May 18, 2019 8:38 pm

I went with the 11 degrees, as that was the best I could get it to. Goes well, no pinking.

Very odd, can't figure why I couldn't get any more adjustment. Cam belt couldnt be any easier to do, marks are definitely lined up. Odd that it was running 34 degrees previously on idle. Shame I didn't check it before I changed the belt, but I didn't want to run it on that belt. Though the marks were correct before as well, so I can't see it would be any different.

I've another distributer coming anyway, as apart from anything else, mine is leaking oil through into the cap, so that's not ideal!



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