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Volvo penta ad41 turbo problems

Old 04-02-2017, 04:04 PM
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Default Volvo penta ad41 turbo problems

Hi I I bought a used 1993 25' foot boat powered by AD41b I/O. My turbo v clamp brok,went to replace clamp noticed turbo was rotting on the exhaust side.. now I need a new turbo. I came across a turbo upgrade for the 41 series PN #3802070. Is the turbo really %35 more low end power vs stock turbo.. also seen some cheap new turbos on eBay..should I stick to the OEM or will the aftermarket be just as good?
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Old 04-02-2017, 04:28 PM
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May want to figure out why your turbo is getting spray, otherwise you'll be doing this again
Old 04-02-2017, 07:46 PM
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the down pipe it's also getting replaced.. I think that's where the salt water is getting to it.. the original owner he said that's the original turbo... crazy thing is there is no shaft play 2,000 hrs on engine.
Old 04-02-2017, 09:10 PM
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That turbo is done. Either the elbow failed or you're getting water dripping down onto the clamp holding the elbow to the turbo.

KKK in Germany was the OEM manufacturer for the Volvo turbos. They were bought by Borg Warner. Custom turbo in Santa Fe Springs, CA has been able to source the KKK turbo outside the Volvo parts network for less than half the cost it would be within the Volvo parts network. You don't get the 2 year Volvo guarantee, but it's the same freaking part.

http://www.customturbo.com/
Old 04-02-2017, 09:14 PM
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Originally Posted by 808fishing View Post
the down pipe it's also getting replaced.. I think that's where the salt water is getting to it.. the original owner he said that's the original turbo... crazy thing is there is no shaft play 2,000 hrs on engine.
2000 hous i s nothing, no way should that turbo be rusted like that. Saltwater is being reverted somehow. Post pictures of exhaust system.
Old 04-03-2017, 05:28 PM
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My v clamp failed while underway went to replace it and found the turbo was bad.. before it failed I knew something was wrong either the turbo or injectors or combination of both by the soot in the water but I still got 3600-3700 rpm WOT depends on weight in vessel.. I ordered a new exhaust down pipe, turbo from borg warner and clamps. Mahalo for the help! Everyone!

I put total of 150hrs on it since I owned it.. I rebuilt the seawater pump the 290dp leg and changed all filters and fluids.. next on the list is checking valve gap.. any other things I should be checking for at 2000 hrs?
Old 04-03-2017, 07:27 PM
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Originally Posted by 808fishing View Post
Hi I I bought a used 1993 25' foot boat powered by AD41b I/O. My turbo v clamp brok,went to replace clamp noticed turbo was rotting on the exhaust side.. now I need a new turbo. I came across a turbo upgrade for the 41 series PN #3802070. Is the turbo really %35 more low end power vs stock turbo.. also seen some cheap new turbos on eBay..should I stick to the OEM or will the aftermarket be just as good?
When I had a pair of 41B engines I put 861260 turbos on both of them. These turbos were from a 42 series engine. Might have been the waterjet engine which made 230 hp without a supercharger. This turbo had different compressor blades. It had dual blades instead of the typical single blade. these turbos did in deed make more boost pressure at all rpms. My engines made 10-12 lbs at 3000 rpm and 27 lbs at 3900 rpm

Before you start replacing turbo's you need to correct why the engine sits so low in the water. Your turbo has seen a lot of salt water. You don't want the new one to look like that one in a couple of months. The turbo should be at least 10 inches above the water line.

I've fished on many volvo diesel I/O boats that had large bait tanks installed in the rear cockpit or on the swim platform. Add 3 or 4 big guys on the starboard rear corner and the static level of the boat becomes very low. This is how water flows up the exhaust system and into the turbo.

I have never owned a Volvo I/O boat. I don't know if the exhaust pipe has a water backflow prevention device.

If your boat has an engine box and there is room, volvo makes a kit that will allow you to raise the engine higher. I know this kit was offered to builders. It might still be available.
Old 04-03-2017, 09:51 PM
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So I just check the water level it's only about 6" above the water lin;?e this might be a problem.. but if the original turbo lasted +20 years ill be happy it this one last that long 🙏

I ended up ordering the 861260 turbo.
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Old 04-04-2017, 11:28 AM
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Originally Posted by 808fishing View Post
So I just check the water level it's only about 6" above the water lin;?e this might be a problem.. but if the original turbo lasted +20 years ill be happy it this one last that long 🙏

I ended up ordering the 861260 turbo.
Good luck with it.

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