Gertrude our 1976 Sopru

[onetrackwonder]

Bellows and missing cable
https//i.imgur.com/j1RSb7S.jpg[/img]]

Oil cooler looks nice and clean
https//i.imgur.com/HeijXpE.jpg[/img]]

Work bench is no full of Kombi bits
https//i.imgur.com/5hXAoGZ.jpg[/img]]

Hopefully tomorrow I will get time to pull the head and have a better look, cheers Greg
 

onetrackwonder, Oct 21, 2019

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Your main jet is at the bottom of the emulsion tube and is certainly blocked. 
So that cylinder was very lean, very hot and definitely what caused the problem
 

Barry, Oct 21, 2019

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Thanks Barry, I'm no expert just a part time hacker but when i stripped the carburettor down it looked to me as an obvious contributor, I'm also guessing that the missing cable to the bellows would have made it even hotter on the run down but when it went bang the bus had been sitting for over an hour at the photo shoot and we only went about 250m before it happened, cheers Greg
 

onetrackwonder, Oct 21, 2019

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The missing cable I take it has broken? Looks like someone has welded up where the studs would be for a mechanical pump.  You got a little bit of work in front of you. at least you most like have the cause of the problem all the best Wayne
 

72 Kombi 8 Seater Microbus
72 Double Cab Ute
76 Single Cab Ute

Wayne murray, Oct 21, 2019

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onetrackwonder said: ↑

Thanks Barry, I'm no expert just a part time hacker but when i stripped the carburettor down it looked to me as an obvious contributor, I'm also guessing that the missing cable to the bellows would have made it even hotter on the run down but when it went bang the bus had been sitting for over an hour at the photo shoot and we only went about 250m before it happened, cheers Greg

Wow that’s a bit messy. And yes, a bit strange only 250m driving when it happened. Perhaps the parts had already broken off and were making their way down the inlet manifold when you pulled up at the photo shoot.

As for the missing thermostat cable, it won’t make it run hotter. It would just mean the fan housing flaps would be in the fully open position all the time, meaning maximum cooling air flow to the oil cooler, heads and barrels even when the engine is cold. That’s the theory if the rest of the system is working properly. However, I suggest you check the flaps do return to the fully open position. There’s supposed to be a spring on the shaft that opens the flaps and it can sometimes break or can be incorrectly installed and that could/would overheat the engine.
 

Chris and Sharyn
Team Fun and Niceness

Mr Beckstar, Oct 21, 2019

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Yes Wayne the cable perhaps was cut and removed because its not connected under the nut and bolt clamp on the flap shaft, thanks Chris, not uncommon for me to get things arse about  cheers Greg
 

onetrackwonder, Oct 22, 2019

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1. I’m a type 1 person normally - but what drives a type 4 mech fuel pump? 
   
   Pretty sure it is a lobe on the cam shaft in a type 1 - so into the sump. 
   
   So why doesn’t the oil fall out here?
    

   
   Barry, Oct 22, 2019Report
   #44LikeReply
   
   
2. 
   KaiWell-Known Member
   Messages:
   
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   Barry said: ↑
   
   

   I’m a type 1 person normally - but what drives a type 4 mech fuel pump?
   
   Pretty sure it is a lobe on the cam shaft in a type 1 - so into the sump.
   
   So why doesn’t the oil fall out here?

   
   could be a fuel injected case which didnt have this section machined out as they used external electric fuel pumps
    

   
   Kai
   1973 semi-camper.
   
   There's time, then there's Kombi time...
   Kai, Oct 22, 2019
   

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Ahhhh..........ok.
 

Barry, Oct 22, 2019

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Kai said: ↑

could be a fuel injected case which didnt have this section machined out as they used external electric fuel pumps

Thanks Kai I was wondering how they welded up the bolt holes and the aluminium looked so perfect, so that is another new thing that I never new about my car as I thought that it had come with carburettors and that they had simply been swapped to the Dellorto's, was the fuel injection an option in 76 as my first 76 which I bought in 78 also had carburettors, I wold have thought that the fuel injection would have been the choice over the carbs,


Mr Beckstar said: ↑

Wow that’s a bit messy. And yes, a bit strange only 250m driving when it happened. Perhaps the parts had already broken off and were making their way down the inlet manifold when you pulled up at the photo shoot.

As for the missing thermostat cable, it won’t make it run hotter. It would just mean the fan housing flaps would be in the fully open position all the time, meaning maximum cooling air flow to the oil cooler, heads and barrels even when the engine is cold. That’s the theory if the rest of the system is working properly. However, I suggest you check the flaps do return to the fully open position. There’s supposed to be a spring on the shaft that opens the flaps and it can sometimes break or can be incorrectly installed and that could/would overheat the engine.

Chris yes the rest of the flappy lids and spring system is working so that is a good start also the lock nut for the cable is there so I just need to inspect and possibly test the bellows and install the cable, the venturie's were in place when I was inspecting the carb at the van park, I'm pretty confident that they melted and fell out as the cast aluminium doesn't red that much heat to dissolve and there was a big fuel bang which also melted the air filter which has a steel element and the top of the filter under the aluminium filter lid was most affected, I'm guessing there was a build up of fuel from the rubber blocking the jet and possibly when there was spark and inlet port open the flame travelled back up the inlet manifold and into the carb, I shut off the throttle straight away and molten ali and a couple of the bigger bits of the venturi were on the top of the butterfly, it really doesn't matter now I just need to get it better again but as of today I have been thrown another curve ball and won't be able to get back to it for another couple of weeks, bugger, cheers Greg
 

Last edited: Dec 18, 2019

onetrackwonder, Oct 22, 2019

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So what type of fuel tank you have,as if Kai suggests that you engine block may have been a fuel injected block and someone converted it over to carburetors,which was a common thing when people had trouble with fuel injection.or getting parts. 76 was the year that fuel injection was out. The tank should have two out lets as such,at the bottom of the tank,Ones a outlet the other is a inlet.
This may lead to some history of your bus if it also had a fuel injected tank also.
 

Last edited: Oct 22, 2019

72 Kombi 8 Seater Microbus
72 Double Cab Ute
76 Single Cab Ute

Wayne murray, Oct 22, 2019

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So if it's originally an f/i it will have a blank spot to the LHS of the RH battery on the firewall (To confirm what the block also says!). About 7" by 1.5". That would have contained the 'computer'! What month is your compliance plate? @Jethro son at Old Bar has an 8/76 that I checked out & it's carb. I walked away & thought & then went back & it had that blank spot so was another conversion. Greg if you still have a computer in that spot I'd be a buyer.
VW introduced F/I to cope with Aus Stds pollution requirements in 7/76 whilst still CKD kits assembled in Aust. From early 77 they were imported from Germany fully assembled with carbs. F/I great but my knowledge is "if you've got a good one you can't break it & if you've got a bad one you can't fix it. Even VW Aust were swapping back to carbs in the warranty period if there was a problem since it had already passed rego!
Cheers
 

Yesterday is history, Tomorrow a mystery, Today is the PRESENT.
Pilot of 'Old Boy' 76 Sopru Fuel Injected
Co pilot Lauren
http://forums.kombiclub.com/threads/76-sopru-resto.54261/
http://forums.kombiclub.com/threads/76-sopru-old-boy.56558/

David H, Oct 22, 2019R

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Wayne and Dave I have had a long day now yesterday, so will check and get back to you both later today, how does the fuel injected engines computer read the crank or flywheel, I ask this because there is a black rubber plug and wire, possibly a sensor that protrudes from the block behind the flywheel on the drivers side that has been cut off and I can't remember ever seeing one, you can see it in this behind the oil near the rear barrel and under the top drivers side bolt, cheers Greg

https//i.imgur.com/IarcvFs.jpg[/img]]
 

onetrackwonder, Oct 23, 2019