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Post by Penguin45 on Oct 19, 2017 23:16:00 GMT
Been rather busy, so not much has happened. I have built another C42 dynamo, but haven't fitted it yet. I cobbled together a 41238 dizzy out of a stack of parts. This one has a decent shaft bearing, so I was rather happier with it. That's been fitted and timed up. A mis-fire has developed over the last few days. Replacing the ignition lead set has restored smooth running.
Chris.
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Post by peppib on Oct 20, 2017 7:04:34 GMT
Mo's dynamo is going begging at the moment Chris - I am more than happy with her alternator conversion, so if your rebuild doesn't work you know where there is a serviceable spare
Dave
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Post by dave1800 on Oct 21, 2017 12:23:52 GMT
Did you convert your car to negative earth at the same time as the alternator was fitted or was it done earlier? If so did you have to reverse the fan connections, I recall Chris posted a Youtube video on this a few years ago? It would be helpful for Chris to know what polarity your dynamo was running if he takes up your kind offer so he can flash it to his car.
Regards
David
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Post by tommydp on Oct 21, 2017 17:52:27 GMT
Hi all!
Curious about the 41238 dizzy, Chris. Thought the 41234 was the one for mk 2 cars. I still have play in the distributor shaft, never bothered to send it back to DD once again. It runs fine though.
I remember we had a discussion on heater fans and polarity changes. At least on my cars they will run slower/ the opposite way when reversed to negative earth.
Regards, Tommy
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Post by Penguin45 on Oct 21, 2017 18:04:00 GMT
Very kind offer from Dave. My car is still positive earth, so I'll probably have to flash off any replacement - I had to with the one from Snoopy's car.
Anyway, the fun never stops. One of my chums in the Wolseley Owners Club has been poking at the Red Dog ands trying to improve its running. A compression test shows 150psi on pot 1, 60psi on 2, 120psi on 3 and 150psi on 4. Shot of oil into 2 didn't improve the pressure, so something is amiss in the head. Tomorrow - off with her head!
Chris.
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Post by dave1800 on Oct 22, 2017 1:10:00 GMT
Hi Tommy! Don't baffle Chris with the ignition you know it's his least favourite subject! You are right of course, the 41238 was made for the Mini and 41234 for the Mk11 crab. Both have the same body so it depends on what weights and springs are inside now and how much the vacuum advance has deteriorated.  regards David Hi all! Curious about the 41238 dizzy, Chris. Thought the 41234 was the one for mk 2 cars. I still have play in the distributor shaft, never bothered to send it back to DD once again. It runs fine though. I remember we had a discussion on heater fans and polarity changes. At least on my cars they will run slower/ the opposite way when reversed to negative earth. Regards, Tommy |
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Post by peppib on Oct 22, 2017 8:11:17 GMT
Did you convert your car to negative earth at the same time as the alternator was fitted or was it done earlier? If so did you have to reverse the fan connections, I recall Chris posted a Youtube video on this a few years ago? It would be helpful for Chris to know what polarity your dynamo was running if he takes up your kind offer so he can flash it to his car. Regards David Mo runs negative earth and has done since the day after I bought her almost 12 years ago (needed to fit a radio) Dave |
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Post by Penguin45 on Oct 22, 2017 17:22:00 GMT
Sorry,didn't word that correctly. The body of the dizzy is stamped 41238. The innards are 41234. Snoopy came over this morning. First task - blitz the garage. I have had an extra garage behind the pub over the road for the best part of twenty years. The new owners wanted it back and gave 48 hours notice, so the contents got dumped in the main garage. Sorting and tidying it all away was one of those mind numbing tasks, so it hadn't happened. Mark and I got it done in a couple of hours.  IMG_20171022_114355 by Penguin 45, on Flickr As can be seen, fun was had. Thanks, Mark. We duly pulled the head off to find No. 2 exhaust valve didn't seem to be seated properly. The valve itself turned out to be horribly caked in carbon and there was some sort of wear lip on the valve seat. I've tried to photograph it, but there's not really enough to see. So, dig up spare head and get it cleaned up.  IMG_20171022_133709 by Penguin 45, on Flickr Mark's wielding the brass brush. Ady came down for a while and gave us some help getting the studs swapped across, before the head was carefully lowered onto a new gasket and everything was built up again.  IMG_20171022_153611 by Penguin 45, on Flickr Set the valve clearances, checked the fluid levels and satisfyingly, she started second turn of the key. Seems to be happy enough and doesn't run on. I'll be doing some proper driving tomorrow, so I'll find out how things go then. Big thanks to Ady and especially Mark for all their efforts today. Great stuff. Chris. |
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Post by tommydp on Oct 22, 2017 18:58:25 GMT
Well done! I've just done the same operation, as the inlet valve on cylinder two was not sealing properly.
It looks like that exhaust valve could be a bit recessed.. or I could be wrong. Good to have a spare cylinder head then:-)
Hope it works well!
Tommy.
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Post by 1800heap on Oct 23, 2017 0:07:55 GMT
Man you boys sure get into it! No sooner said than done. Nice work.
On the cylinder head rebuild. I was wondering if you have heard of shimming two of the rocker pedestals slightly to get rid of some of the noise they generate. I read it somewhere and wondered if it was a legitimate practice? Its supposed to preload the shaft a bit! What do you think? May have just been an Oz idea!
Nick
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Post by dave1800 on Oct 23, 2017 1:11:01 GMT
Hi Tommy Did you establish the cause for the inlet valve not sealing, was it possibly due to a build up on the back of the valve from oil fumes fed via the pcv? I see this is a problem on some new direct injection engines as the fuel doesn't wash it off as it does with manifold injection. The approved solution is to feed ground walnut shells into the manifold -seriously! David Well done! I've just done the same operation, as the inlet valve on cylinder two was not sealing properly. Tommy. |
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Post by peppib on Oct 23, 2017 7:29:12 GMT
Great job there guys.
I have a spare head ready assembled, just in case. I don't have a SWMBO so it lives, wrapped in a towel, in the bottom of a wardrobe in my bedroom! 
Dave
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Post by dave1800 on Oct 23, 2017 7:55:15 GMT
I think I've been watching too many horror movies as I picture a head wrapped in a towel in the bottom of the wardrobe. David |
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Post by snoopy11 on Oct 23, 2017 16:59:29 GMT
Man you boys sure get into it! No sooner said than done. Nice work. On the cylinder head rebuild. I was wondering if you have heard of shimming two of the rocker pedestals slightly to get rid of some of the noise they generate. I read it somewhere and wondered if it was a legitimate practice? Its supposed to preload the shaft a bit! What do you think? May have just been an Oz idea! Nick I have heard of shimming the pedestals under the rocker shaft. I have no idea why but it was something done in the factory |
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Post by Penguin45 on Oct 23, 2017 17:13:25 GMT
Yup, under the two centre pedestals. It bends the rocker shaft a smidge. 12H3960 if you want them.
I have now taken the car out for a proper run about. Much, much better. Performance has risen from "slightly sluggish" to "quite lively". Temperature is stable and it stops on the key without running on. Result.
Thanks to all involved.
Chris.
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