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Engine Specific Info and Questions => IDI Engine => Topic started by: 1.6Lmarine on October 16, 2017, 11:03:54 pm
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I have a 1.6L diesel off of a 89 Jetta that is nearly rebuilt. Since it's going in a boat I don't need the vacuum pump.
In the factory manual it doesn't even show the vacuum pump but a plug where the vacuum pump inserts. Obviously you need the gear on the pump to drive the oil pump.
The inside of that gear has a groove that has been pounded out on the old pump. I need to replace it.
I haven't disassembled the pump to see if that gear can be replaced separately, or do you have to replace the whole pump with a new one? I haven't found a gear separate from the pump on the net.
If I have to get a new pump to get an undamaged gear drive then how to best make the pump inoperable, or do I need to?
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Funny this comes up. I just bought a rabbit, and while looking at it I noticed there was no vacuum pump. There was only a plug where it used to be. Obviously the brakes are worthless. You could probably just put a vacuum plug over the main port.
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...thanks
...isn't the gear involved with the intermediate shaft?
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You could probably just put a vacuum plug over the main port.
no, remember vacuum pump has a gear, this is run from IM shaft, this has slot, this runs oil pump. <this gear with a slot must be part of a cover. there may be a subject with this reference. its been a while,.
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You could probably just put a vacuum plug over the main port.
no, remember vacuum pump has a gear, this is run from IM shaft, this has slot, this runs oil pump. <this gear with a slot must be part of a cover. there may be a subject with this reference. its been a while,.
I didn’t investigate at all. But since it has to be driving the oil pump, there must be a gear attached to the cover being driven by the IM shaft which would turn the oil pump. I’m not getting a low oil pressure light or any knocking so it’s obviously pumping oil LOL.
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...thanks
i'll look for that link tomorrow unless someone posts a link in the mean time
great help
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the inside of that gear has a groove that has been pounded out on the old pump. I need to replace it. Just replace the pump it is more available. In fact I have three in my spare parts stuff so I could get you one cheap.
I haven't disassembled the pump to see if that gear can be replaced separately, or do you have to replace the whole pump with a new one? I haven't found a gear separate from the pump on the net. The Gear does come off by driving a pin out of it I think. But really just put another pump on it and let it pull a vacuum in one side and blow air out the other. you might be able to hook it up to a vent and get rid of vapor build up.
If I have to get a new pump to get an undamaged gear drive then how to best make the pump inoperable, or do I need to? Repurpose the pump action, Bilge pump?
Send a PM and I will let you know about the spares I have.
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The wear on the oil pump shaft or vac pump gear is unimportant unless it gets so extreme that the oil pump can spin in the vac pump gear. You're only halfway there when the vac gear looks like a big bowtie or when the oil pump shaft has two sharp points.
If you can track down the non-vac pump parts you could do that. If not, then assuming you have the rotary style, you could just pull the vanes, plug the vac pump inlet, and let the pump freewheel.
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pulling the vanes is smart, or find a vacuum reservoir and you will probably need a hard line to hook it up to, it beats blocking off a line and having pump pull vacuum like that on its self. gives it a buffer.
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The parts to run it with no vacuum pump are incredibly rare. They do exist, VW diesels are often found in things like gensets and forklifts where the vacuum pump isn't needed, but actually finding those parts is extremely difficult.
If it's the old diaphragm style pump then I'd definitely be looking for a way to get rid of it. The vane style pumps are quite happy operating with their inlet completely blocked off.
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Pulling the vanes on the rotary pump would be better than just capping it or running to a reservoir - it would reduce the pumping losses.
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If not, then assuming you have the rotary style, you could just pull the vanes
...what do you mean when you say 'pull the vanes'?
thanks
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Do you have a rotary or diaphragm style pump?
Rotary:
(https://images-na.ssl-images-amazon.com/images/I/51JlaCoXxPL._SX355_.jpg)
Diaphragm:
(https://www.partsplaceinc.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/9/2/vw-1-6l-vacuum-pump-for-rabbits-and-others-9228.jpg)
If it is the rotary style, then remove the three m6(10mm head) bolts that hold on the cover and lift off the cover. There are 4 vanes in the pump. Remove them. Put the lid back on. No more pumping, the shaft will then just freewheel.
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i dont understand how or what they did, but i have seen people who machined the gears or something form the pump in order to use a 16v cap
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...thanks all
...it's a rotary pump
"If it is the rotary style, then remove the three m6(10mm head) bolts that hold on the cover and lift off the cover. There are 4 vanes in the pump. Remove them. Put the lid back on. No more pumping, the shaft will then just freewheel."
...that's great...i'll take it apart and have a look
...stay tuned
...i'd still be looking for the outer gearing with a better inner slot
i hear and believe what has already been said about the old one lasting...but my OCD is coming through that having rebuilt the entire engine having ONE part on it that's not new would take all the fun out of boating with it! lol
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(https://uploads.tapatalk-cdn.com/20171123/30f19d8c6ed416341d01051a02b022df.jpg)(https://uploads.tapatalk-cdn.com/20171123/b362db23740126ecd1b215b81580bd65.jpg) Here’s how the 1.5 in my rabbit is set up without a vacuum pump. Brakes are a pain without it though.
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Is there anything to support the top of the gear/oil pump shaft from deflecting?
Steve.
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Can you add a 12 v electric pump to replace the mechanical one?
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Is there anything to support the top of the gear/oil pump shaft from deflecting?
Steve.
The oil pump shaft has one of the gears as part of it and it is a very close tolerance machined fit where it runs through the oil pump case. There is another oil pump shaft bushing that it pressure oiled near the top of the shaft.
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I have some marine 1.6D parts, shoot me a PM