Neutron
Jetboaters Admiral
- Messages
- 3,427
- Reaction score
- 5,752
- Points
- 377
- Location
- New Bern, NC
- Boat Make
- Yamaha
- Year
- 2016
- Boat Model
- AR
- Boat Length
- 24
What was your end result measurement.So I’ve been in the process of rebuilding the 2 vx110 engines out of my ar210. Reading the service manual it says the main oil bearing clearances are .0002” - .0012” normally speaking. the crank mains measured around 1.3381. Typical rule of thumb on bearing clearances is usually .0010” for every inch of journal diam. which should be around .0013”. Because I was skeptical about having such tight clearances, I called SBT and asked a tech what they do on their rebuild. They told me they go with the largest bearing size I think they told me green. He said the bearing clearance should only matter at an idle and when warmed up on RPM it wouldn’t matter. My guess is they don’t follow the service manual specs rebuilding these engines and putting larger bearings in the engines which creates lower oil pressure. Hopefully this weekend if we don’t get rained out I’ll be able to install both engines back in the boat and verify I have good oil pressure
I would not listen to SBT and go by the factory specs