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#270509 08/16/09 8:46 pm
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In an effort to stop the oil leak from the top end of my '75 MkIII, I ordered the recommended PCV valve. I would appreciate some advice on the best means of mounting and connecting the valve. The vendor's website indicates the IN/OUT connections as in the attached picture. Should I assume IN connects to the engine case and OUT connects to the oil tank? Does it matter at what point in the vent line the valve is connected? I'm also interested in the best way/place to mount this beast.

Thanks,
rickt

[Linked Image]


rickt

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That's neat. I've only ever seen the cheap plastic flapper valve from the "Help" rack (made in Chain). You're right about the in to case, out to tank. If you suck/blow on the in or out, it shoud open and close abruptly with little pressure and be obvious which way round it goes. I don't think it will make much difference where in the line it goes, it's going to have to deal with some oil mist regardless. Where did you get that?

Last edited by waspfarmer; 08/16/09 10:45 pm.

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There has been some research done with PCV valves on Norton Commandos. The findings are, the closer the valve is to the engine, the more effective it is. This would mean using the rear crankcase vent instead of venting from the timing case. IIRC, the timing case should be blocked off as well.

The brass 90° barb fitting I added. [Linked Image]

Last edited by Jim Clausen; 08/16/09 11:04 pm.
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Closest to the crankcases works best but it's a bit bulky to put near the motor. The photo from Jim looks like about the neatest solution. Believe me, they do work a treat. Solved the last of my oil leaks. People don't believe this, but I could feel a power increase too. Matt Rambow says it's measurable on a dyno and I believe him.

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Quote
People don't believe this, but I could feel a power increase too


After I installed mine I blew by a Ducati Monster. Did I mention the Duc was parked?

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rickt Offline OP
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PCV valve was purchased from MikesXS.com.
Part # 15-0677
Cost $16.00

rickt


rickt

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'87 BMW K75C
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While you have the valve out can you measure it. There is not much available space on these bikes. I like the valve but as I said I have a 19 amp battery and Podtronics unit taking up most of that space. If I can find a place to put it I think I will also get one.

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rickt Offline OP
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Finally getting around to attempt an installation of the PCV valve. I'm just a bit uncertain of the proper hook-up. Based on my visual inspection the only vent I find coming from the crankcase is shown on the picture (black arrow). Is this the correct point to connect the valve? Should I try to mount it closer to the oil tank.

Thanks,
rickt

[Linked Image]


rickt

'74 Trident
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'76 BMW R90S
'87 BMW K75C
'87 BMW K75C

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[Linked Image]
You can see where I mounted mine as close to the timing chest as I could get it. If you ever need a place to mount a rectifyer I mounted my 3 phase Podtronics unit to the existing mounts for the stock aircleaner. Looks like it belongs there.

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Originally Posted by rickt
PCV valve was purchased from MikesXS.com.
Part # 15-0677
Cost $16.00

rickt


How much was shipping?

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I was able to mount mine to the outside of the right side engine plate just under the front of the transmission. You can't see it unless you bend over but even so it looks OK. Had to make a new bracket though.

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rickt Offline OP
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Shipping = $7.58


rickt

'74 Trident
'75 Roadster
'76 BMW R90S
'87 BMW K75C
'87 BMW K75C

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rickt Offline OP
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zotz,

Did you use the Yamaha valve? Any change you could post a pic of your mounting set-up. Sounds like it would be a good approach for my project.

Thanks,
rickt


rickt

'74 Trident
'75 Roadster
'76 BMW R90S
'87 BMW K75C
'87 BMW K75C

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Wish you had sent the dimentions.....bet if you removed the bracket that it comes with to lighten it a bit and install it as I did the help valve, the hose itself would support it in place and not look too bad in the process. Realestate on these bikes is at a premium, I'm not giving up the 19 amp battery or 3 phase alternator. They turned this bike into a turnkey trouble free bike, along with the Micuni.

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rickt Offline OP
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Here are the approximate dimensions:

[Linked Image]


rickt

'74 Trident
'75 Roadster
'76 BMW R90S
'87 BMW K75C
'87 BMW K75C

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I removed the mounting bracket and ground one of the ears off the valve and installed mine on top of the tank. Used stock hose from the timing cover and a short piece of hose from valve to filler neck. Worked so good, I bought two more for Triumph projects.

[Linked Image]

Best $16 I've ever spent.

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rickt- I don't have a photo bucket set up but I will email you a pic. If you want to post it feel free - zotz

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Excellent pics. Thanks all. My Motormite check valve ain't werkin no mo and I was afraid one of these wouldn't fit my limited space.


Dave from CT
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hey rickt, which drawing program do you use to dimension those photos? nice job


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