Faulty Crankcase Valve?

bigcol · Posted: Mon Oct 20, 2014 4:06 am Post subject: Faulty Crankcase Valve?

I'm been having issues with rough running for some years now after engine warms (worse on higher temperature days) and heavily relying on past forums to try and problem solve. Next on my list was crank case and vaccum system.

1. Checked my crank case valve and noted the ballcheck (bearing) is rattling inside after shaking it. Is this normal??

2. I removed the fording assembly some years ago (due to non use) and connected the valve direct into the engine port. It is still tubed to the side cover manifold but not adjustable. Could "shortening" the crank case breather assembly also cause rough running??
_________________
Regards,

Col Barber
51 M38

Xamon · Posted: Mon Oct 20, 2014 7:45 am Post subject:

If you removed the fording system did you make sure to properly vent the fuel tank?
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Carievale Saskatchewan Canada
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album210&op=modload&name=gallery&file=index&include=view_album.php

bigcol · Posted: Mon Oct 20, 2014 2:12 pm Post subject:

Yes..vented through the air cleaner.
_________________
Regards,

Col Barber
51 M38

wesk · Posted: Mon Oct 20, 2014 9:42 pm Post subject:

http://home.comcast.net/~sday77/binky/index.htm

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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

bigcol · Posted: Tue Oct 21, 2014 4:12 am Post subject:

Thanks for direction to that site. Very informative.

Getting back to orginal question. What is rattling inside the valve?
_________________
Regards,

Col Barber
51 M38

AAHUNT · Posted: Tue Oct 21, 2014 6:57 am Post subject:

The rattle is ok...it means the internal parts are free and moving. A normal check for a PCV valve is to shake it and listen for a rattle to make sure that the valve is not stuck (open or closed) with oil sludge. However, just because the PCV rattles does not mean you still don't have a problem...There are other signs to look for too.

Here's a pretty good page with info:
http://www.agcoauto.com/content/news/p2_articleid/197
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-Andy

1954 M38A1

wesk · Posted: Tue Oct 21, 2014 9:34 am Post subject:

That is a very good article. He hides the troubles symptoms a bit . One point he does bring up is simply replacing or eliminating the valve during other troubleshooting as in your case rough running is the easiest way to rule out the valve as your problem.

Also the original valves can be dis-assembled and cleaned and inspected. Just screw them apart.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php


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