Thread: Oil Pressure jet removal
08-06-2011, 04:11 PM #1
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?
08-07-2011, 09:40 AM #2
08-07-2011, 02:17 PM #3
Their is no check valve in the 06+ blocks.
08-07-2011, 03:27 PM #4
Interesting. Thanks for replying. I wonder why they have removed that
08-08-2011, 08:28 AM #5
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.
08-08-2011, 01:37 PM #6
08-08-2011, 02:40 PM #7
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.
08-08-2011, 02:48 PM #8
08-08-2011, 04:28 PM #9
- Join Date
- Apr 2009
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.
08-08-2011, 08:14 PM #10
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