Re: Stus-List Engine water cooling woes on Yanmar 3GMD

Does your through hull have an external strainer? That can get covered in marine growth causing a flow restriction at higher RPMs. Cheers, Al SV Elendil, 37/40+ ___ This list is supported by the generous donations of our members. If you wish to

Re: Stus-List Engine water cooling woes on Yanmar 3GMD

Thanks for the comments, but We have had the pump off a couple of times. The belt was tightened when we put it back on. There has always been water with pressure coming out of the pump, the higher the revs the more water. Whether enough pressure is hard to tell. In terms of the old

Re: Stus-List Engine water cooling woes on Yanmar 3GMD

On Sun, Jun 4, 2017 at 8:42 AM, mike amirault via CnC-List < cnc-list@cnc-list.com> wrote: > I agree with Josh. I have seen this happen when your water pump drive belt > is too slack; it will pump at low RPMs but not higher RPMs. Happens with my Universal 25XPB. My test is to try to turn

Re: Stus-List Engine water cooling woes on Yanmar 3GMD

Fair enough. Either way you need to watch the pump pulley to make sure its turning. On Jun 4, 2017 11:11 AM, "Edward Levert via CnC-List" wrote: > Be careful not to over tighten the belt. I believe 1/2 in. deflection is > called for. If too tight, you may ream out the

Re: Stus-List Engine water cooling woes on Yanmar 3GMD

The bushing on the impeller doesn't fail. There is a key in the impeller bushing, that fits over a pin or set screw that keeps the impeller in place. It should only turn when the pulley turns. Hold the impeller while turning the pulley. If it turns, the pin is missing. Also check the tension

Re: Stus-List Engine water cooling woes on Yanmar 3GMD

Be careful not to over tighten the belt. I believe 1/2 in. deflection is called for. If too tight, you may ream out the slotted hole of the water pump pulley and round down the end of the shaft. I know as I had this happen to a newly rebuilt pump. Ed Levert C 34 Briar Patch New Orleans On Sun,

Re: Stus-List Engine water cooling woes on Yanmar 3GMD

I agree with Josh. I have seen this happen when your water pump drive belt is too slack; it will pump at low RPMs but not higher RPMs. Sometimes, during the idle winter season, the drive belt will develop a “set” and cause slippage. Tension your drive belt and try again. Mike Amirault C 33ii

Re: Stus-List Engine water cooling woes on Yanmar 3GMD

Did you watch the pump each time the water stopped? I think your belt may be slipping when you throttle up. Josh Muckley S/V Sea Hawk 1989 C 37+ Solomons, MD On Sun, Jun 4, 2017, 1:08 AM DON JONSSON via CnC-List wrote: > Hello > > Today on the first trip out for the

Stus-List Engine water cooling woes on Yanmar 3GMD

Hello Today on the first trip out for the weekend on the boat I got about 5 minutes out and the engine over heated. Spent the next 3 hours trying to figure it out before towing the boat back in with the dinghy. Another 2 hours at the dock and still no luck. Perhaps someone can help. First