Author Topic: Cylinder base o rings  (Read 398 times)

0 Members and 1 Guest are viewing this topic.

Online topcat3815

  • Site Supporter
  • Full Member
  • *****
  • Posts: 317
Cylinder base o rings
« on: February 13, 2020, 07:20:17 AM »
Im changing the heads on a late model twin cam with 21,000 miles, Do I need to replace the base O rings? Thanks in advance for all replies

Offline koko3052

  • Full Member
  • Posts: 5754
  • Country: ca
Re: Cylinder base o rings
« Reply #1 on: February 13, 2020, 07:58:59 AM »
Be careful & don't bump the cylinders loose & I never have a problem. If I do remove the cyls. for some reason other than a bore & hone I leave the pistons inside when removing.

Offline Jim Bronson

  • Site Supporter
  • Full Member
  • *****
  • Posts: 3297
  • Country: us
Re: Cylinder base o rings
« Reply #2 on: February 13, 2020, 12:39:02 PM »
I had a leak around the cylinder bases about a month ago. It got so bad I had a shop open it up to replace the o-rings. They looked fine to me, and I don't know why they would leak, but apparently they did. The cylinders were out of round and wearing too much, so that may be the reason. I'm replacing everything south of the heads as soon as the parts arrive (Monday, I hope). If they're not leaking, I'd say just be careful and reuse them.
Going down that long, lonesome highway. Gonna live life my way.

Offline Pirsch Fire Wagon

  • Full Member
  • Posts: 983
  • Country: us
Re: Cylinder base o rings
« Reply #3 on: February 14, 2020, 06:29:07 PM »
I replace the base Gaskets and Seals on whatever I remove the heads on. You're talking 15 - 30 mins max additional time and the cost of the Seal/Gasket. Many EVO's kind if dictated that as many have leaked. I can't speak to the TC or M8 because I just do them anyway.
Tom

Offline moose

  • Site Supporter
  • Full Member
  • *****
  • Posts: 3184
  • Country: us
  • Toms River New Jersey
Re: Cylinder base o rings
« Reply #4 on: February 15, 2020, 03:34:17 AM »
its good to have a second pair of hands to make sure the cylinders down pull when you pull the head
Moose aka Glenn-

Offline jsachs1

  • Full Member
  • Posts: 1494
  • Country: 00
Re: Cylinder base o rings
« Reply #5 on: February 15, 2020, 02:22:31 PM »
I replace the base Gaskets and Seals on whatever I remove the heads on. You're talking 15 - 30 mins max additional time and the cost of the Seal/Gasket. Many EVO's kind if dictated that as many have leaked. I can't speak to the TC or M8 because I just do them anyway.
Standard procedure here without fail. :wink:
John