AQAD41 - Replacement K&N Air Filter

alt

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Ever on the quest with the friends 305 Statesman....

Makes more sense (as easier to remove) to replace with a K&N.

Can anyone point me to an online shop (Amazon / eBay) as to which replacement cone filter I need? I'm not at the boat so not sure what diameter the hose needs to be.

Many thanks!
 

superheat6k

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On my last boat with TAMD60C I fitted K&N RU2940 which fitted neatly on the Turbo inlet stub pipe, which I expect will be the same on your AQAD41, but this was a largish cylindrical filter, rather than a cone. It rested neatly on the bracket intended for the original cylindrical Baldwin unit. I used a large jubilee clip from the baldwin gently nipped up to hold it in place.

I used cheap 3in1 spray oil rather than the somewhat expensive K&N oil, and this worked just fine. WD40 mostly evaporates so is a waste of space for oiling a wet filter.
 

wofforduk

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I have just done this to my AD41's, you need a few 90's, a reducer and a few 3 inch straights.. looks alright by me!2019-02-09 13.07.03.2.jpg
 

wofforduk

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No clue to be honest, only done the mod and haven't taken her out as found other issues like leaking bellows thats knackered the starter motor, plus what else the salt will have affected too :(
 

Portofino

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Read somewhere that these oil film filters can potentially smear up a thicker film on the charge air coolers fine fins .
Eventually you have another reason for a drop in performance.
Realise the short term economic argument Vs chuckawy dry paper elements.

Looked into it all as MAN,s when spooling up have a turbo whistle and it’s always there to a lesser extent at a good cruise rpm eg 1800 .
We actually like it , but some don,t and depending on the soundproofing it attracts some criticism sos there’s an aftermarket supplier filling a gap in the market called “ Walker airsteps “ .

After considering the pros and cons of OEM paper and oil mesh ,bearing in mind the secondary benefit ( for those who get annoyed ) reduction of the turbo whistle , we dicided to leave well alone .
My MAN engineer did not recommend them either citing oil contamination of the CAC fins argument.

I guess it depends how much reduction this potential oil film has on the CAC efficiency.
Different for every marque and the set up those engines are in .
 

wofforduk

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Short pipe is from the rocker cover breather, this would normally go in just before the turbo.

I am no oil expert but surely the tiny amount of oil on the filters would not make any difference compared to the crankcase breather and oil seals on the turbos ?

My reason for changing them was I didn't have the original air filter housing when I bought the boat.
 

Mr Googler

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I think I went with RD-1460 but measure your turbo intake collar diameter to double check as it was 2 years ago I can’t be sure.

y4mYQbNqp5hhAwi410fhOfPyzT0UqUYJFVRHWTtuQp3-EIo4uzYgKiXQPkucRlWuhsBZEL0uUwXj707yjg6elIFpRRjXupCnFILprD3hE94NawTfdJXH2-20DG2Na7FUYaza9TCB10e9f3GYxnjxGp9CVQZOAkvpRoWzcuGhxdx3hjxGDEdkiWSTdZDF6aN_S-3oz-IzKs9Cvq4vnZ3DX_Hnw
 

Portofino

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I am no oil expert but surely the tiny amount of oil on the filters would not make any difference compared to the crankcase breather and oil seals on the turbos ?
.

Yes in that case I would have thought so in examples where crank rebreathers sending fumes back round .

However some marques like MAN don’t recirculated the fumes they have seperate filters .So no oily air ends up going across the intercoolers fins .

Just worth factoring in the buying decision.
It’s just when you “ service “ them in theory wash them in some solvent , dry them then reapply the oil film .Its that replication bit that’s tricky getting right , over do it accidentally then that’s you extra oil mist .

I know in performance cars guys have run into trouble with oil mist over the MAF censors leading to a Check Engine Light ( CEL ) on the dash ,Also other senors down stream getting oil fogged resulting in a CEL .

Obviously diesels old and new don,t have MAF ( mass air flow ) censors , but theses day modern diesels might have some other censors down stream ( especially those that don,t recirculate crank + rockerbox fumes ) which are adverse to even the smallest oil mist created by the empirical “soak lightly “ in oil service regime.

Then you ( more like a tech with a laptop ) are chasing you tail with CEL,s on the dash .

As you say can’t see it being a issue with older diesels that recirculate anyhow .
 

QBhoy

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I think I went with RD-1460 but measure your turbo intake collar diameter to double check as it was 2 years ago I can’t be sure.

y4mYQbNqp5hhAwi410fhOfPyzT0UqUYJFVRHWTtuQp3-EIo4uzYgKiXQPkucRlWuhsBZEL0uUwXj707yjg6elIFpRRjXupCnFILprD3hE94NawTfdJXH2-20DG2Na7FUYaza9TCB10e9f3GYxnjxGp9CVQZOAkvpRoWzcuGhxdx3hjxGDEdkiWSTdZDF6aN_S-3oz-IzKs9Cvq4vnZ3DX_Hnw

Thanks for the reply. I’ll have a look. I could do with it. Stop me knocking the bloody clips off the standard filter casing, every time I reach round to drain the starbd cooler drain plugs.
Do you also find the starboard oil filter a bloody hassle ?
Ps...your exhaust system is very different from ours. Ours comes out the turbo into a 5/6” pipe, straight out the sides of the hull. Only a small take off pipe through the reverse gear cooler. Looks like yours all goes through the cooler ? Didn’t imagine such a small bore would take it. Must be a fair backpressure ?
 

Assassin

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Does the K&N filter make the engine burn leaner with less smoke

No, a diesel engine runs with a surplus of air and having even more air in a surplus of air makes no difference, if it is electronically controlled the system will only inject the correct amount of fuel depending upon load, the air input still remains the same.

As for the element lubricating oil, beware here as they use a specific type of filter oil and while it is expensive from K&N they buy it in themselves and you can buy it to the exact specifications from discount retailers, these are floating fibres which move around and trap the dirt as they move and the wrong oil prevents this from happening.
 

Mr Googler

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Thanks for the reply. I’ll have a look. I could do with it. Stop me knocking the bloody clips off the standard filter casing, every time I reach round to drain the starbd cooler drain plugs.
Do you also find the starboard oil filter a bloody hassle ?
Ps...your exhaust system is very different from ours. Ours comes out the turbo into a 5/6” pipe, straight out the sides of the hull. Only a small take off pipe through the reverse gear cooler. Looks like yours all goes through the cooler ? Didn’t imagine such a small bore would take it. Must be a fair backpressure ?

You can just see the oil filter in that picture (right hand side below the breather) so it was ok. If it was in the standard location I’d never have reached it!

One of the reasons for changing was to get rid of the air boxes. They are a right pain!

As you figured, the smaller pipe is the seawater connection from the gearbox oil cooler to the elbow.
 

robrennie

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Hi, I fitted the below to my AD41’s.

K&N Ru-0940 2-3/4"Flg O/S, 5-1/2"Od, 3"H Compatible

The connection part is slightly off centre - this was needed for me as the lifting eye is quite close by - not sure a round one will fit.
 
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