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Re: BIB5566
Posted: Sat Oct 16, 2021 7:16 pm
by knapmann
This weekends "while I'm in there job" was a new MFI pump drive belt. The current one could be anything up to 30 years old and you don't want one of these snapping miles from home.
While I was in there I re-adjusted the timing which was a lot more hassle than it should have been. The timing was about half a tooth out. You should be able to adjust this out quite easily on the gear on the pump but the gear on mine was stuck solid. I used a puller to get it off. You could see that the hub that the gear sits on was marred around the edges in places for some reason so that you could only get the gear on and off by whacking it. There was certainly no turning it to adjust it once in situ. Fortunately as its an ally hub it only took me about 30mins of sanding the marred areas down with fine sand paper and offering up the gear numerous times before it would slip on just right and adjust easily in place. With this done I was able to adjust the timing just perfect. Not sure if it will really make much difference mind you!
BIB5566
Posted: Sat Oct 16, 2021 8:20 pm
by hot66
It won’t
… I’ve accidentally had my pump,running 2 teeth out before and you couldn’t really tell any difference
Re: BIB5566
Posted: Sun Oct 24, 2021 4:38 pm
by knapmann
More bad news today! Its becoming a theme. Took my clutch off to find I have the 1969S spec 1 year only aluminium clutch setup. In theory thats great, but not when your pressure plate is worn down to the aluminium base material and replacement pressure plates are impossible to find and very spendy indeed. The only good news is that the equally rare clutch disc looks brand new.
I could swap to a T/E spec steel pressure plate, but then I'd need to replace the clutch disc too as they are different thicknesses. Not sure which way to go.
Do you think its possible to re-face pressure plate with new a new layer of steel? I have no idea how this is applied...
Re: BIB5566
Posted: Sun Oct 24, 2021 6:56 pm
by IanM
knapmann wrote:The only good news is that the equally rare clutch disc looks brand new.
The clutch disc pictured is not an original 69S part.
Is there a part number on it? I wonder if it's a re-issue from Porsche?
Re: BIB5566
Posted: Sun Oct 24, 2021 8:56 pm
by knapmann
IanM wrote:
The clutch disc pictured is not an original 69S part.
Is there a part number on it? I wonder if it's a re-issue from Porsche?
The disc in the photo is just a random VW disc i used to strip the gearbox down with
Re: BIB5566
Posted: Sun Nov 07, 2021 7:42 pm
by knapmann
Re: BIB5566
Posted: Mon Nov 08, 2021 10:32 pm
by knapmann
Finally scored the last piece of my gearbox rebuild puzzle. I was all ready to go until I found my R&P was goosed. Took a while but at last I have my hands on a good used set which seem very hard to find for some reason. Ive added it to the rest of my goodies pile and will soon be sending it all out for assembly.
Re: BIB5566
Posted: Fri Dec 24, 2021 7:31 pm
by knapmann
Re: BIB5566
Posted: Sun Dec 26, 2021 3:49 am
by RobFrost
Howcome you replaced the side cover?
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Re: BIB5566
Posted: Sun Dec 26, 2021 1:59 pm
by 911hillclimber
To bomb proof the box from the cw&p making an exit sideways, a good mod imho.
Re: BIB5566
Posted: Sun Dec 26, 2021 4:46 pm
by knapmann
RobFrost wrote:Howcome you replaced the side cover?
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Obviously its much stronger, I am future proofing it really. It was a luxury part that may not be necessary but when the whole thing is being rebuilt and the R&P is being re-set as well, it makes sense to do it now, plus I was getting the other parts from CMS anyway.
Re: BIB5566
Posted: Sun Dec 26, 2021 10:17 pm
by RobFrost
I'm tempted to ask if the old one is available as my clutch hoop has worn off, but I heard they need shimming so it may be easier just to add a bracket to my existing one.
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Re: BIB5566
Posted: Mon Dec 27, 2021 10:54 am
by knapmann
RobFrost wrote:I'm tempted to ask if the old one is available as my clutch hoop has worn off, but I heard they need shimming so it may be easier just to add a bracket to my existing one.
Sent from my SM-G988B using Tapatalk
I think that my 901/13 side cover is 1 year only, 1969, it is different to the earlier side cover (diff was smaller size pre 69) and the later side covers (changed to pull clutch). So unless you need a 901/13 specifically its no good to you.
Re: BIB5566
Posted: Mon Dec 27, 2021 6:19 pm
by RobFrost
I understand mine's one year only, push clutch, but 1970. I have a special trunnion and replacement bolt from a guy in the US. Not very clear, but I have a picture. You can see the hoop worn off. What difference in the side cover would I be looking for to determine it's different to yours?
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Re: BIB5566
Posted: Mon Dec 27, 2021 7:18 pm
by knapmann
RobFrost wrote:I understand mine's one year only, push clutch, but 1970. I have a special trunnion and replacement bolt from a guy in the US. Not very clear, but I have a picture. You can see the hoop worn off. What difference in the side cover would I be looking for to determine it's different to yours?
Im not sure what the difference is but the cable mounts are different for the push or pull type clutch. If you go on to the CMS website and look to order a billet side plate for the 911 gearbox there is the option of either the late 69 push clutch version or the 70-71 pull clutch version. There isnt a specific photograph of the different versions side by side though.