Crankcase Breather Hose

 
 
 
 
 
 
broms
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Crankcase Breather Hose

 ·  Posted: 24.02.2014  ·  #1
Hi

Don’t know if anyone can advise me but here goes.

The crankcase breather hose from my 1994 Hymer B564 (2.5 diesel non turbo 132000 miles) has in the past been disconnected from the air filter and routed down to the bottom of the engine compartment where it vents to atmosphere. I am guessing it was done by the previous owner to prevent the oil vapour venting directly into the air filter housing and thereby ensuring it cannot carry on running on its own oil vapour – not very practical and a bit messy. I thought I would fit an oil catchment tank to the van and then take the outlet from the catchment back to the air filter.

Question I have is none of the catchment tanks I have seen are the same size bore as the existing crankcase breather hose, if I fit a reducer to the crankcase breather pipe and then go into the oil catchment tank (I think it is a 25mm stepdown to a 19mm) and then reverse it back up to the air filter is this likely to cause back pressure problems for the engine. Worse case scenario is that I vent to air after the oil catchment tank instead of running the hose back to the air filter.

Many thanks

Phil
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Re: Crankcase Breather Hose

 ·  Posted: 24.02.2014  ·  #2
Sorry Phil but I'm no use to you on this one,

but I'm sure you will get an answer soon,


Remember if its not broken don't fix it ;-)
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Re: Crankcase Breather Hose

 ·  Posted: 24.02.2014  ·  #3
Why not simply connect it back up to the air filter housing?
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Re: Crankcase Breather Hose

 ·  Posted: 24.02.2014  ·  #4
well the reason i don't want to reconnect it is the amount of blowback oil that is coming out - I have a feeling that was the reason it was disconnected in the first place. I need to get an engine compression test done to see what the state of the piston rings are - I suspect the engine is past its best sadly, but she is still chugging along at 60 mph + so just doing the catchment tank will clean the problem up hopefully!
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Re: Crankcase Breather Hose

 ·  Posted: 24.02.2014  ·  #5
Ah, I'm with you now.. Yeah, a catch tank would be a great idea in that situation.

Out of curiosity, I just had a poke around the internet and boy, some of those can be quite expensive. Aimed at the performance car enthusiast no doubt... Good luck in your search.
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Re: Crankcase Breather Hose

 ·  Posted: 24.02.2014  ·  #6
Why not route the pipe up behind the bulkhead and stick it into a plastic bottle.That way you collect the oil that is blown out and you can check how much is being blown out.
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Re: Crankcase Breather Hose

 ·  Posted: 24.02.2014  ·  #7
At the moment the pipe is routed down behind the radiator grill. Don't want raise the height of the pipe in case of implementing a syphon action.

The catchment tanks can be expensive don't plan on spending a huge amount on one lol
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Re: Crankcase Breather Hose

 ·  Posted: 25.02.2014  ·  #8
How much room do you have to spare in the engine bay?

If it were me, I'd drop into my local scrap yard/metal recycler to see if they had some sorta small vessel that'd suit. Weld on a couple of 25mm tubes, maybe get fancy and put a drain valve on the bottom and bobs yer uncle.

I've seen a few of the old vintage car lads to use an oul vintage gallon oil can as a catch tank. Looks pretty cool too... 8-)

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Re: Crankcase Breather Hose

 ·  Posted: 25.02.2014  ·  #9
Quote by broms

Hi

Don’t know if anyone can advise me but here goes.

The crankcase breather hose from my 1994 Hymer B564 (2.5 diesel non turbo 132000 miles) has in the past been disconnected from the air filter and routed down to the bottom of the engine compartment where it vents to atmosphere. I am guessing it was done by the previous owner to prevent the oil vapour venting directly into the air filter housing and thereby ensuring it cannot carry on running on its own oil vapour – not very practical and a bit messy. I thought I would fit an oil catchment tank to the van and then take the outlet from the catchment back to the air filter.

Question I have is none of the catchment tanks I have seen are the same size bore as the existing crankcase breather hose, if I fit a reducer to the crankcase breather pipe and then go into the oil catchment tank (I think it is a 25mm stepdown to a 19mm) and then reverse it back up to the air filter is this likely to cause back pressure problems for the engine. Worse case scenario is that I vent to air after the oil catchment tank instead of running the hose back to the air filter.

Many thanks

Phil

Hi,
Is it possible the original mod was done because of exhaust omissions for the purpose of MOT
if oil & oily vapour going into air filter this could have an effect on the exhaust omissions?
broms
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Re: Crankcase Breather Hose

 ·  Posted: 25.02.2014  ·  #10
@Blag - must admit that was my thought but getting access to welder isn't easy at the moment - but will have a look around I really don't want to spend much more then I have already LOL.

@Beaky because of its age I don't think emissions play much part in it at the moment - having read up all I can I am fairly certain the mod was done to stop engine runaway whereby the diesel engine will keep running on its own oil even if the power to the engine has been killed. I have tried repeatedly to get in contact with the previous owner but they are touring Europe somewhere LOL
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Re: Crankcase Breather Hose

 ·  Posted: 25.02.2014  ·  #11
I am probably wrong but should there not be wire mesh in the pipe to catch the oil and let it drip back into the sump , I would be worried about the DOE test , re emissions and oil dripping into non standard equipment in the engine compartment . A compression test sounds like a good idea too
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Re: Crankcase Breather Hose

 ·  Posted: 25.02.2014  ·  #12
The oil vents under the engine compartment and not onto any other part of the engine. This is why I want to fit a oil catchment tank so that the oil is retained and not vented. Because of the age of the van the emissions are not tested.
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