Jump to content

Time to Vote for Tractor of the Month!
Garden Tractors and Parts on eBay



Photo
- - - - -

Is 8" Enough?


  • Please log in to reply
6 replies to this topic

#1 artbuc OFFLINE  

artbuc

    Member

  • Senior Member
  • Member No: 1059
  • 72 Thanks
  • 158 posts

Posted October 29, 2013 - 05:11 PM

Lol! Re my Kohler Magnum M18S, specs say compression should be at least 90 psi with both cylinders within 15% of each other. Crankcase vacuum should be 13-20" water at 3200-3600 rpm. Well, my compression is fine at 110/115 psi but my crankcase vacuum is low at only 8" of water. I checked vacuum with and without muffler so I know muffler is not restricted. Also, I inspected the breather and it is fine. She starts fast and runs great. Should I be concerned about the low crankcase vacuum? Thanks.

Edited by artbuc, October 29, 2013 - 05:12 PM.


#2 LilysDad ONLINE  

LilysDad

    --Crazy about GTTalk-- 'sort of'

  • Senior Member
  • Contributor
  • Member No: 10443
  • 11,230 Thanks
  • 8,557 posts
  • Location: N. Illinois, DeKalb County

Posted October 29, 2013 - 06:07 PM

You should be embarrassed for yourself. Trying to get attention like that!


  • Dieselcubmike said thank you

#3 MH81 ONLINE  

MH81

    Proud to be Deplorable

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 802
  • 29,262 Thanks
  • 29,430 posts
  • Location: N. W. PA

Posted October 29, 2013 - 06:11 PM

If your vac drops low, I think the first thing to suffer will be your fuel pump.. I remember reading that the low restriction air filters can affect vacuum. Also, I think the breather leaking can cause some issues.

#4 glgrumpy ONLINE  

glgrumpy

    Getting Out!

  • Senior Member
  • -GTt Supporter-
  • Member No: 8360
  • 7,589 Thanks
  • 7,201 posts
  • Location: Huntington, IN 46750 North East in State

Posted October 29, 2013 - 08:18 PM

Crankcase Vacuum??  You are first guy I've heard of who cared or had way to measure. If it runs right and no leaks or smoke, who cares about Vac?    Just my 1/2 cent here! ha!



#5 marlboro180 OFFLINE  

marlboro180
  • Senior Member
  • Member No: 10710
  • 635 Thanks
  • 954 posts
  • Location: SE WI

Posted October 29, 2013 - 08:33 PM

LMAO Rich...


  • LilysDad said thank you

#6 bgkid2966 OFFLINE  

bgkid2966

    Member

  • Senior Member
  • Contributor
  • Member No: 8254
  • 1,409 Thanks
  • 1,330 posts
  • Location: Aurora, Illinois

Posted October 29, 2013 - 08:38 PM

Crankcase Vacuum??  You are first guy I've heard of who cared or had way to measure. If it runs right and no leaks or smoke, who cares about Vac?    Just my 1/2 cent here! ha!

 

 

I agree.



#7 artbuc OFFLINE  

artbuc

    Member

  • Senior Member
  • Member No: 1059
  • 72 Thanks
  • 158 posts

Posted October 30, 2013 - 02:35 AM

I agree.


Thanks. I checked it because my front oil seal had come loose out of the block and I had to pull the engine to replace it. Wanted to be sure it was not due to crankcase over pressure. I already had a manometer which I had made to fix my gas furnace.




Top