Whaler Central - Boston Whaler Boat Information and Photos

Posted by rockinhitz34 on 04/24/18 - 9:37 AM

Took the motor out to start today and she ran great. Replaced impeller and gaskets yesterday, had a steady stream of water from the tell tale. I ran the motor for 15 minutes at idle and then shifted into fwd and reverse just to test. all seemed good. Tell tale water wasn't very warm which could be because today isn't very hot (~60F outside). However, I noticed that the upper exhaust port didn't have much water mist coming out.

I pulled the plugs to check them and they seemed OK, yet on the 3 and 4 cyl outside there was emulsified fuel/water on the case and outside of the plugs. Im wondering if I could have a head gasket/thermostat/cooling channel issue. Is there a good way to test powerhead temperature with a thermometer laser thingy? I have a seloc manual but they don't list normal operating temperatures. I just want to make sure I don't have a cooling problem before I run at speed in the water this summer.

Thanks, I appreciate the help.

Posted by fitz73222 on 04/25/18 - 9:48 AM

rockinhitz34 wrote:
Took the motor out to start today and she ran great. Replaced impeller and gaskets yesterday, had a steady stream of water from the tell tale. I ran the motor for 15 minutes at idle and then shifted into fwd and reverse just to test. all seemed good. Tell tale water wasn't very warm which could be because today isn't very hot (~60F outside). However, I noticed that the upper exhaust port didn't have much water mist coming out.

I pulled the plugs to check them and they seemed OK, yet on the 3 and 4 cyl outside there was emulsified fuel/water on the case and outside of the plugs. Im wondering if I could have a head gasket/thermostat/cooling channel issue. Is there a good way to test powerhead temperature with a thermometer laser thingy? I have a seloc manual but they don't list normal operating temperatures. I just want to make sure I don't have a cooling problem before I run at speed in the water this summer.

Thanks, I appreciate the help.

Posted by fitz73222 on 04/25/18 - 9:48 AM

Posted by fitz73222 on 04/25/18 - 9:58 AM

There is nothing wrong with your engine from a cooling perspective. The engine does not have a thermostat by design so the water out of the tell tale will always be relatively cool. The above water exhaust relief rarely has an water coming out of it except an occasional spit of water unlike the larger in- line 6 cylinder version. To check temperature, hold your hand on the exhaust plate on the port side of the engine while running in the water and it should be cool to slightly warm. These engines run fairly cold. You should always be able to hold you hand on that plate without any discomfort. Your description of emulsified oil and water on the exterior of the block cover needs further explanation. I have seen anti-corrosion sprays when subject to moisture take on a milky appearance that resembles what you are describing. If there is no water leaking around the plug and there is no water on the firing surface of the plug. I would not worry about it.

Posted by rockinhitz34 on 04/26/18 - 11:37 AM

fitz73222 wrote:
There is nothing wrong with your engine from a cooling perspective. The engine does not have a thermostat by design so the water out of the tell tale will always be relatively cool. The above water exhaust relief rarely has an water coming out of it except an occasional spit of water unlike the larger in- line 6 cylinder version. To check temperature, hold your hand on the exhaust plate on the port side of the engine while running in the water and it should be cool to slightly warm. These engines run fairly cold. You should always be able to hold you hand on that plate without any discomfort. Your description of emulsified oil and water on the exterior of the block cover needs further explanation. I have seen anti-corrosion sprays when subject to moisture take on a milky appearance that resembles what you are describing. If there is no water leaking around the plug and there is no water on the firing surface of the plug. I would not worry about it.

Thanks for the reply. I cant tell if the water jacket cover is leaking. There was no water on the cylinder side of the plug, only on the exterior. My plugs from last year had some serious corrosion on the exterior. Im thinking that the water jacket gasket might be the culprit. When I run the motor again next week Im going to test temp as you have described and see if I can see any water leaking around the plugs from the water jacket cover.

In terms of degrees in Fahrenheit, whats a good approximation of operating temperature? Thinking in the 130-150 degree range.
Thanks again!

Posted by fitz73222 on 04/27/18 - 2:13 AM

Believe it or not, you'll be lucky to see 100 degrees, they really run cool since there is no thermostat. Don't be surprised that your lower plug corrosion is nothing more than the plugs getting occasionally wet from backwash when you slow down coming off of a plane. I've seen lots of engines with lower one or two plugs with corrosion like that particularly in salt water.