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  1. M

    Tuliped valve causes

    Yes. Part of the problem is with how the boat is used. Bunch of people in the boat and pulling a tube or board while the boat is plowing thru the water. When I look at RPM history, I see a lot of hours between 2-3,000 But the machine shop usually wants to replace more then one valve. They say...
  2. M

    Tuliped valve causes

    Guessing your over propped for how you use the boat. Do you use the boat for water sports?
  3. M

    Winterizing Mercruiser 4.3 question

    I'm not sure when anti-freeze became required. High quality marine service providers have been doing it for decades so I really didn't pay much attention when MerCruiser made it official. My guess is that it was around the time they were designing the single point drain system and realized there...
  4. M

    Torque specs 2009 SX-A prop shaft brg holder

    That’s the spec for checking rolling torque with the old bolts. During final assembly you use new style bolts and torque to 15-20 ft. lbs.
  5. M

    Goodbye to Volvo Penta cone clutch shifting

    Say hello to Volvo Penta silent shift. Cone clutch shifting was good —— the competition had it copied, tested and ready to market the day the patent expired—— but it could have some issues. They could be a bit touchy to the quality of gear lube, untrained techs could have trouble with...
  6. M

    The newest Mercury outboard service bulletin

    Unauthorized Modifications to the Engine Control Module (ECM) Models Affected All Mercury Engines, All Years Bulletin No. 2019-08 Looks like they are cracking down.
  7. M

    The newest MerCruiser service bulletin

    Unauthorized Modifications to the Engine Control Module (ECM) Models Affected All Mercury Engines, All Years Bulletin No. 2019-09 Well it's not really the newest, That's a FSM recall. But it does look like they are going to crack down.
  8. M

    How to winterize your motor without draining the water.

    How to winterize your motor without draining the water. How’s that for clickbait? I’ve spent over 30 years as a marine mechanic in Minnesota, so after winterizing over 3000 engines (without breaking any) I do have some thoughts on putting a boat to bed for the winter. What I don’t have is the...
  9. M

    Prestige trailker parts

    Hi, Can anybody tell me where to find disc brake and spindle parts for a Prestige trailer? Its a M/N BT225 6,000lbs tandem axle. Looks like the company went out of business in 2009. Was bought by Heritage Custom trailers, has anybody tried to get Prestige parts from them? Thanks Muc
  10. M

    New I/O engine alingment tool

    I see a lot of posts about I/O engine alignment. From doing this job I know it can be a little tricky to tell if the engine has to go up or down, or even side to side. Mercruiser has come out with a new alignment tool part number 8M2001017. It really makes this job much easier. Its MSRP is a...
  11. M

    Cobra Trim Sender

    Part number 984748 supersedes to p/n 3850470 both are NLA. Any good ideas? Thanks MUC
  12. M

    Boat alarms

    I’m looking for a boat monitoring system. I want to monitor, high bilge water, battery voltage and some pressure mats / door switches for intruder protection. The boat is slipped at the customer’s house which is 1200ft away from the lake. There is no shore power available so I’m looking for...
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