Page 1 of 2 1 2 LastLast
Results 1 to 10 of 14
  1. #1
    SJL Custom's Avatar
    Join Date
    Jun 2008
    Location
    Toronto, Ontario
    Posts
    253
    +1
    10

    Oil Pressure jet removal

    I know its suggested to either upgrade the oil pressure jet to the rotax racing version or remove it completely and upgrade to the 06+ rocker shaft, but what does the 06+ have as a check valve to prevent the oil from draining from the head? I was removing a oil jet from a 05 block and noticed that the factory jet acts as a check valve as well. Anybody know if there is in fact a check valve still in place in the 06+ blocks?


  2. #2
    SJL Custom's Avatar
    Join Date
    Jun 2008
    Location
    Toronto, Ontario
    Posts
    253
    +1
    10
    Somebody has to know the answer to this

  3. #3
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
    Join Date
    Aug 2007
    Location
    Tampa Bay, FL
    Posts
    9,202
    +1
    673
    Their is no check valve in the 06+ blocks.

  4. #4
    SJL Custom's Avatar
    Join Date
    Jun 2008
    Location
    Toronto, Ontario
    Posts
    253
    +1
    10
    Interesting. Thanks for replying. I wonder why they have removed that

  5. #5
    SJL Custom's Avatar
    Join Date
    Jun 2008
    Location
    Toronto, Ontario
    Posts
    253
    +1
    10
    One other thing i noticed was the fact that the timing chain tensioner, which relies on oil pressure to set tension, is after the oil restrictor path. This means that on the pre 06+ machines, the timing chain tensioner can never hold the same amount of tension as the 06+ models. That might explain why my timing chain guides have excessive wear, especially on the untensioned return side. Looked like the chain was loose and hiting the guide alot. Ill post pics later on.

  6. #6
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
    Join Date
    Aug 2007
    Location
    Tampa Bay, FL
    Posts
    9,202
    +1
    673
    Quote Originally Posted by SJL Custom View Post
    One other thing i noticed was the fact that the timing chain tensioner, which relies on oil pressure to set tension, is after the oil restrictor path. This means that on the pre 06+ machines, the timing chain tensioner can never hold the same amount of tension as the 06+ models. That might explain why my timing chain guides have excessive wear, especially on the untensioned return side. Looked like the chain was loose and hiting the guide alot. Ill post pics later on.
    The tensioner is in the block, and gets high pressure oil prior to the 04-05 jet.

  7. #7
    SJL Custom's Avatar
    Join Date
    Jun 2008
    Location
    Toronto, Ontario
    Posts
    253
    +1
    10
    Not on the engine i have before me right now. The oil passes through the jet/restrictor into the head and back down to the chain tensioner.

  8. #8
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
    Join Date
    Aug 2007
    Location
    Tampa Bay, FL
    Posts
    9,202
    +1
    673
    Quote Originally Posted by SJL Custom View Post
    Not on the engine i have before me right now. The oil passes through the jet/restrictor into the head and back down to the chain tensioner.
    I think your looking at the path wrong, or I don't understand what your describing?.... high pressure oil from the rear oil pump comes up that port through the block, and then into the rocker shaft. I think it was 06?..... but their was an upgraded tensioner for these engines. Not sure for what reason though?

  9. #9
    Oil is regulated by the 2mm bore in the rocker shaft. You can remove the check valve but you have to use an 06+ rocker shaft to regulate the oil. That was started on 06 motors.

  10. #10
    SJL Custom's Avatar
    Join Date
    Jun 2008
    Location
    Toronto, Ontario
    Posts
    253
    +1
    10
    Click image for larger version. 

Name:	102_2046m.jpg 
Views:	85 
Size:	105.1 KB 
ID:	248803Click image for larger version. 

Name:	102_2047.jpg 
Views:	75 
Size:	98.8 KB 
ID:	248793Click image for larger version. 

Name:	102_2049.jpg 
Views:	69 
Size:	89.3 KB 
ID:	248791Click image for larger version. 

Name:	102_2048.jpg 
Views:	79 
Size:	82.6 KB 
ID:	248797Click image for larger version. 

Name:	102_2050.jpg 
Views:	66 
Size:	123.3 KB 
ID:	248789

    Heres pics of how the oil flow goes. The red line is the oil flow direction and the blue circle is where the oil restrictor/jet is located

    The other pics are the wear on the chain guide because this machine was run with riva ecu but no oil jet upgrade.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	102_2052.jpg 
Views:	60 
Size:	84.8 KB 
ID:	248794   Click image for larger version. 

Name:	102_2046.jpg 
Views:	57 
Size:	102.2 KB 
ID:	248792   Click image for larger version. 

Name:	102_2051.jpg 
Views:	55 
Size:	116.0 KB 
ID:	248795   Click image for larger version. 

Name:	102_2053.jpg 
Views:	66 
Size:	96.7 KB 
ID:	248790  

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Tip of the day: Changing out the oil pressure jet
    By Green Hulk in forum Sea Doo How To & FAQs
    Replies: 22
    Last Post: 06-21-2014, 02:15 PM
  2. Tips on removing stock oil pressure jet???
    By grantuk in forum 4-Tec Performance
    Replies: 4
    Last Post: 04-08-2008, 12:41 PM
  3. oil pressure jet location?
    By beachboy66 in forum 4-Tec Performance
    Replies: 4
    Last Post: 07-21-2006, 04:21 PM
  4. Rotax Oil Pressure Jet, necessary to pull the head off?
    By excess in forum 4-Tec Performance
    Replies: 12
    Last Post: 07-01-2006, 10:02 AM
  5. Replies: 10
    Last Post: 05-31-2006, 09:50 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •