KAD 42 Super charger clutch - quickie on wiring

Update.

The coil backing plate was not a precise fit especially the locking pin. This allowed for it to wobble and wear away until the coil wires came into contact with the pulley and short out

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I'm a bit peeved as it's largely down to the locator pin being a fraction of a mm too small that started this off.
 
Good you arrived at a diagnosis .
whats the learning msg here for others ?
i,am thinking OEM parts in pretty packaging ? ....at a pretty price to match ?
I know it’s a tough call as the price difference is often significant.
 
Portofino said:
Good you arrived at a diagnosis .
whats the learning msg here for others ?
i,am thinking OEM parts in pretty packaging ? ....at a pretty price to match ?
I know it’s a tough call as the price difference is often significant.
Click to expand...
not a tough call at all!
always get the cheapest that seems to fit, and make sure you make it fit, simple :p
 
When it went on It seemed more that tight enough. It's amazing what difference maybe 0.25mm can make though. It was enough for the vibration to elongate the locking pin hole and voila within 25nm
 
What's not balanced Porto? To my knowledge you will never find a belt driven pulley not subject to vibration.
 
OK, here is a challenge. Show me a belt that is on a clutch that doesn't get a brief harmonic on engaging and disengaging the clutch. If you can you'll have found one that defies physics. Balance has absolutely zero to do with it.
 
He’s only done minimal hrs with it .
I would dig deep into the aetiology and get a understanding of it eliminate the cause , by a thorough understanding of the pathology.
Enlarging the pin , might just result in a even bigger hole in the softer alloy casing ....a few more hrs down the line .

If it’s out of balance sufficiently to cause that , with a little pin then consideration with a view to replace the part begins to make sense .


I think we have all regretted sometimes ( not always ) not going the OEM route with parts
 
Portofino said:
He’s only done minimal hrs with it .
I would dig deep into the aetiology and get a understanding of it eliminate the cause , by a thorough understanding of the pathology.
Enlarging the pin , might just result in a even bigger hole in the softer alloy casing ....a few more hrs down the line .

If it’s out of balance sufficiently to cause that , with a little pin then consideration with a view to replace the part begins to make sense .


I think we have all regretted sometimes ( not always ) not going the OEM route with parts
Click to expand...

The original is no longer made Porto. I thought it was a Volvo part on purchase as it carries a Volvo number but no matter which route I went down I wasn't going to get an original part. And you need to stop fixating about balance. There is no imbalance. When the clutch engages it always will cause the belt to wobble for a very brief moment. Like a stringed instrument. Lasts maybe half a second but it is enough. There is no adjustment that can be made anyway.
 
Is there a tensioner bearing in the system ? If so how old is it ? How does it work ?
In the automotive world theses tensioner bearings tend to wear and that lead to excessive belt wobble .
They are regularly changed out , even if they appear ok .
 
Was it the starboard engine Bruce? Wonder if the lose of power steering fluid has anything to do with it.

extra strain on the belts of fluid contamination of belts/clutch?
 
Starboard yes, but no. The reservoir sits on a bracket behind the SC and bounced out to fall below the engine. Without oil the pump runs freely. Have you not seen your SC engage? There is always a brief wobble in the belt after which it runs smoothly. It's straight forward physics. Like plucking a guitar string. Lasts as long as it takes the clutch to fully engage.
 
BruceK said:
The original is no longer made Porto. I thought it was a Volvo part on purchase as it carries a Volvo number but no matter which route I went down I wasn't going to get an original part. And you need to stop fixating about balance. There is no imbalance. When the clutch engages it always will cause the belt to wobble for a very brief moment. Like a stringed instrument. Lasts maybe half a second but it is enough. There is no adjustment that can be made anyway.
Click to expand...
Bruce, Volvo often change the part number when they use a new supplier. I guess that with a Volvo part you can have more confidence that it will be to the same spec as the original and should work out of the box. If it's a duff part then you can be sure that dealers will complain.

With a pattern part, as you have purchased, it could be any old Air Conditioning clutch that some company has sourced.

I guess there are some parts that it's safe to use a pattern equivalent for and others that will be inferior.

There are a couple of active Facebook Groups for VP engines. Might be worth asking somewhere there if they can recommend a better pattern part?

@volvopaul will correct me if I'm wrong, but I recall that he's not happy fitting OEM parts for the very reason you have discovered.

Sorry if this sounds patronizing, it's not my intention!

Pete
 
Never looked.....normally looking forwards at that point ?

did you change the pulley bearing? I’m guessing the magnet shouldn’t contact the the pulley at anytime
 
The whole clutch assembly was replaced. That includes the pulley with bearing. Thing is, if you look at it it is quality built. And I do mean quality. I do believe it is an original Ogura clutch just not one for the T17 obviously. Maybe better suited to the D series engines. Like I said, I'm out of options, Volvo dont supply the original clutch any more. Not for at least 3 iterations of it
 
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