Storma
New member
Has anyone overhauled a supercharger or had it professionally overhauled ?
Thanks
Thanks
Volvo Penta KAMD supercharger
- Thread starter Storma
- Start date
DavidJ
Well-known member
Hi and welcome.
I‘m interested what’s wrong with yours. If it’s the clutch mechanism, it’s an easy fix with a decent set of circlip pliers and the electro clutch unit is available for £250 ish. I’ve never heard of a whole unit failing hence my interest.
I‘m interested what’s wrong with yours. If it’s the clutch mechanism, it’s an easy fix with a decent set of circlip pliers and the electro clutch unit is available for £250 ish. I’ve never heard of a whole unit failing hence my interest.
Storma
New member
Hi David thanks for getting back. The supercharger has always been noisy. I’ve had the boat 5 years now. The engine had 350 hours when I bought her and now has about 750 hrs. It’s more of a clattering sound than a whine. Engine runs great and gets noticeably quieter when the chargers cuts out around 2200 revs. I just find annoying and would like to overhaul, I assume a bearing has failed. Clutch mechanism works fine.
Any help much appreciated. Thanks, Tony.
Any help much appreciated. Thanks, Tony.
Momac
Well-known member
Google found this
DavidJ
Well-known member
Refurbished or repainted?
There must be dozens of secondhand ones around off old KAD42’s 32’s etc and because they are generally used for a couple of minutes ever trip then old secondhand would be a reasonably safe buy at the right price say £500
But where are they?
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Storma
New member
Hello All, thanks again for replies, Brookroyd marine ( also listed as West end marine) is an option, they offer an exchange service for £1600. Seems a bit pricey and also a bit of an unknown.
I’ll take the supercharger off the engine and consider dismantling. I think it’s the rotating vanes that are clashing.
Any further information or advise greatly appreciated.
I’ll take the supercharger off the engine and consider dismantling. I think it’s the rotating vanes that are clashing.
Any further information or advise greatly appreciated.
kashurst
Well-known member
If the vanes are clashing it will make a terrible noise. If you take the top outlet off you can have a look inside and see what's going on.
I am assuming you have checked to supercharger oil etc?
Storma
New member
Hi Thanks for your comments, oil level is ok I changed the oil last year condition was good.
When it cuts in it is noisy, thought maybe there’s contact between the two sets of vanes. I’m finding it difficult to get detailed information with regards maintenance and / or repairs. So all help much appreciated.
DavidJ
Well-known member
If you do a diy can you take some pics to show on here. This is a rare event.
Phone Coastalrides. They carry all sorts of VP secondhand spares which don’t always appear on their website.
Phone Coastalrides. They carry all sorts of VP secondhand spares which don’t always appear on their website.
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Storma
New member
Ok David I’ll see how it goes and if helpful to others I’ll take some pictures and provide some details. It will be a few weeks before I start, it’s rather chilly out here in the Wild West (Scotland)
DavidJ
Well-known member
Get in quick
Parting out a KAD 42
Parting out a KAD 42
A_8
Active member
They are all really very noisy and it’s unlikely they fail at 350 hours and if they sound the same and do their job after 750 hours I would be inclined to leave them as is. If I still could not leave it I would start by comparing the sound of mine to another one before spending my money.
Storma
New member
Hello All, thanks again for comments and information. Agree a direct noise comparison between mine and similar SC would be really useful. Just need to find another boat / owner with similar close to home.
I find it hard to accept that it should sound so “rough”. I’ll keep making enquiries.
I find it hard to accept that it should sound so “rough”. I’ll keep making enquiries.
DavidJ
Well-known member
Does yours sound like this. Listen for the supercharger kick in at 12 secs
The volume on the video is quite low so it’s in reality a lot lot louder but if you have the same frequency noise then nothing to worry about
Storma
New member
Thanks this has been really useful, no it doesn’t sound like that, I don’t get the high pitched whine rather as I described it’s more of a rough clatter. So reinforces my position in that all’s not well with the SC. The bulge / depression in the hose coupling indicating the SC is working again is really useful. Boats out of the water at the moment so can’t test that. Just need to decide now what I’m going to do about it. Thanks again.
Edmund182
New member
hi my boat is doing this noise when it gets just past 1800rpm i haven’t try togo any further that this rpm imcertain that comes from the s/c should i buy a new s/c or the cluch can be replace it?? Please help
DavidJ
Well-known member
If it’s making that noise cutting in at 1800 then it must be the s/c doing its job and it the clutch is working ok. Your choice but I would take the revs up to 2500 and you will hear the s/c cut out at about 2100 (from memory)
From what you describe you don’t have a problem.
Edmund182
New member
Thanks alot david today me and family when out on the boat for first time on the year i did what you say and everything when well that noise coming from the supercharger got less noticeable whit higher rpm thanks !!!
BruceK
Well-known member
Check its not crank to waterpump belt slipping when you engage SC. People forget thst one looking just at SC belt forgetting the crank belt drives that one first. And yes when it slips the noise soynds nothing like a loose alternator belt. It bellows. If your SC was damaged it would simply not turn. Even a spot of oil on the vanes would make them stick. Easy enough to take the manifild off an clean check. USE CORRECT SEALANT when putting them back on though
Storma
New member
Hi Folks, just an update, I’ve inspected the supercharger inside and it looks pristine. Turns freely and no indication of bearing failure and rotors clear of each other. Made some inquiries with a specialist engineer company and after some research on their part concluded that due to its design and construction there’s really no serviceable parts. Other than the clutch.
Turned my attention to the clutch, plate clearance within tolerance at 0.55mm and clutch operating with external 12v at connector terminals.
I’m changing both the drive belts as they’re probably the originals. Boat still out of the water at the moment but I’ll do some further checks on the clutch operation when I’m back afloat.
Open to any further thoughts and or checks I could do.
Incidentally I read on some previous threads that having the SC disconnected has no I’ll effects on the 42/43 engines as the pump will manually compensate fuel flow. My boats semi displacement and I often run at or just above displacement speed so might not make that much difference to me. Anyone had any experience running with SC disconnected. Thanks again.
Turned my attention to the clutch, plate clearance within tolerance at 0.55mm and clutch operating with external 12v at connector terminals.
I’m changing both the drive belts as they’re probably the originals. Boat still out of the water at the moment but I’ll do some further checks on the clutch operation when I’m back afloat.
Open to any further thoughts and or checks I could do.
Incidentally I read on some previous threads that having the SC disconnected has no I’ll effects on the 42/43 engines as the pump will manually compensate fuel flow. My boats semi displacement and I often run at or just above displacement speed so might not make that much difference to me. Anyone had any experience running with SC disconnected. Thanks again.
