| Author |  Topic  |
x96
V4 Fanatic
Spain
417 Posts |  Posted - 16 Apr 2012 : 18:32:59  
| Another strange point is the bottom gasket. I've found this mounted under the carb:
But in the 96 interior waste paper bin I've found this:
It has less holes and I don't know why but suspects me that it is the original one. what do you think? |  |
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Woody
V4 Guru
United Kingdom
2764 Posts | Posted - 16 Apr 2012 : 19:46:35
| I suspect that the bottom gasket fitted between the base of carburettor and the intermediate plate, and the top gasket was for one side of the sealing spacer (item 8 in the parts page). It does however appear to missing two holes in the centre.
The sealing spacer appears to be breaking up per your pics above. Is it plastic? | |
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x96
V4 Fanatic
Spain
417 Posts | Posted - 17 Apr 2012 : 15:49:04
| You're right Woody, the gasket is the same that goes with the intermediate item 8:
But as it can be seen in the photo the thicker gasket has holes in the middle, the thinner hasn't. Are they incorrect?.
The thick gasket is not plastic, something similiar to cardboard well pressed.
Another photo showing the curved carb.
The carb seen from the intermediate bottom
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x96
V4 Fanatic
Spain
417 Posts | |
melle
V4 Guru
United Kingdom
3833 Posts | Posted - 17 Apr 2012 : 17:03:58
| Those are the original gaskets! The one pictured with the fewest holes indeed goes between the vacuum intermediate plate and the bottom part of the carb. Between the intermediate plate and the manifold should be a metal gasket (OK to be replaced with a slightly thicker paper gasket, you won't find new metal ones).
All decent motor factors should be able to provide DIY gasket sheets. From time to time cheap overhaul kits for Pierburg 32/35 DIDTA carbs. (Audi 80/ 100) turn up on eBay. Not all parts are usable (you'll have to reproduce the lid gasket yourself and the acceleration membrane's axle has to be machined), but as a bonus you'll get fresh jets and more importantly a fresh needle.
Don't forget to smear some liquid gasket on all faces of the gaskets!
Check the gas valves' axles for play, they're also suspect for vacuum leaks.
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
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x96
V4 Fanatic
Spain
417 Posts | Posted - 17 Apr 2012 : 21:05:26
| I'm not sure about remove the intermediate plate, it looks well fitted.
The several gaskets had a bit of silicone sealer, but someone make a mistake interchange the gasket. I will rebuild new ones.
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x96
V4 Fanatic
Spain
417 Posts | Posted - 19 Apr 2012 : 15:26:37
| I've sanded also the top part of the carb.
And time ago I removed the booster. I don't know if I will notice a big difference in power but it is one thing less prone to fail.
I covered the hole with a hard silicone to avoid vacuum. The small cilinder with the spring was not very well attached to the carb cover.
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melle
V4 Guru
United Kingdom
3833 Posts | Posted - 19 Apr 2012 : 17:13:33
| quote:
Originally posted by x96
I'm not sure about remove the intermediate plate, it looks well fitted.
I wouldn't take the risk of vacuum leaks now you've taken the pressure off. I'd take it off and either reuse the metal gasket (if still in place) with a bit of liquid gasket or otherwise replace it with a paper gasket and some liquid sealer.
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
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x96
V4 Fanatic
Spain
417 Posts | Posted - 19 Apr 2012 : 20:49:24
| Ok, I will follow your advise, it's true, now that I'm busy fixing the other gasket better to fix all of them.
Would it be related to a suddenly lack of vacumm on the brakes? It happen when the car stalls, one second later the brake pedal is hard and the vacumm help is lost. I checked the valve on the hose that goes to the servo and it seems correct.(closes in one direction) | |
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x96
V4 Fanatic
Spain
417 Posts | Posted - 19 Apr 2012 : 20:57:04
| quote:
Originally posted by melle
From time to time cheap overhaul kits for Pierburg 32/35 DIDTA carbs. (Audi 80/ 100) turn up on eBay. Not all parts are usable (you'll have to reproduce the lid gasket yourself and the acceleration membrane's axle has to be machined), but as a bonus you'll get fresh jets and more importantly a fresh needle.
Don't forget to smear some liquid gasket on all faces of the gaskets!
Check the gas valves' axles for play, they're also suspect for vacuum leaks.
How do Iknow that I need a fresh needle (what is that? the bottom needle that makes idle?)or fresh gets?
The carb doesn't look very old, probably the car has the 68.000kms (42.000mi) that shows the clock. Difficult to know in any case. | |
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melle
V4 Guru
United Kingdom
3833 Posts | Posted - 19 Apr 2012 : 21:17:52
| The needle is the valve that regulates the inflow of fuel into the float chamber, it's operated by the float. Part no. 74:
The needle wears by its constant movement and in the end will close off poorly, causing the float chamber to overfill and by effect the engine to run poorly.
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
|
x96
V4 Fanatic
Spain
417 Posts | Posted - 08 May 2012 : 16:12:00
| I think that the needle closes correctly. It closes easily.
Sanding the carb is a very tedious worlk
I've been repairing the thick gasket. Better than to use the new cord gasket
The new gasket
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x96
V4 Fanatic
Spain
417 Posts | Posted - 08 May 2012 : 16:26:28
| 
I'm not sure that the position of the vacumm lever of the automatic choke is correct
The vertical lever doesn't touch the spring, is it correct? it just touch the metalic lever of the choke plate. | |
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x96
V4 Fanatic
Spain
417 Posts | Posted - 09 May 2012 : 09:26:16
| Here it is a bit clearer
"A" doesn't touch the spring "B".
Actually only touch "C" | |
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x96
V4 Fanatic
Spain
417 Posts | Posted - 13 May 2012 : 15:22:10
| Carb fitted and ready for adjusting idle.
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| Topic | |
SAAB 96 GL scrapyard run
