Silverado6x6
Cadet
- Joined
- Mar 24, 2008
- Messages
- 26
I am a heavy equipment mechanic in Alaska, I have over 30 years background with gas and diesel engines, but nothing on outboards, I have worked with 2 cycles on snowmachines so I have the comprehensive of what to adjust but here is my story.
My employer brings his fishing boat to me, he sucked up sand through the jet drive and overheated the motor so bad that the thermostat was melted together with sand particles.The over temp sensor had the threaded plug melted off thats moot as it wasn't hooked up anyway, he says that he could not even get the motor to crank at one point and hand to haul boat upriver against current, not a good day for him. I suspect that it was heat resistance and a possible loose ground stud.
So early this morning I pulled the jet drive off to check the water pump, it was fine, we had it briefly running the day before and there was no tell tale stream. So I decided to first check compression, all three around 117-123, this was to just use for reference, I pulled the head off and found the water jackets filled and packed solidly with sand, I wadded up some shop towels in the cylinders and blew out all the sand. We are waiting for a thermostat right now but after putting everything back together the engine is hard to start and seems to have only half power, the VRO is disconnected and plugged, I picked up some Seafoam and am going to spray some into the engine after I get some throttle up, with the t-stat out right now I think the engine is way too cold to attempt and adjustments and right now does not want to run very well, too cold?
With the engine block getting so hot to melt a t-stat what else internally could be cooked? The rings appeared to be OK, no seizure or scuffing on the cylinder walls.
When I mean cold the engine is literally ice cold as its getting water from a huge plastic tank we have cut just for it, it holds over 200 gallons. But of course we are in Alaska and we have to order everything, no idea how long before t-stat shows up, I am thinking of making a temporary t-stat plug with a small bypass hole like 1/8th inch, just enough to circulate out an air pocket but holding water back to get engine up to an operating temp. Tomorrow I will hook up my Snapon timing light to each coil and see if I am lossing spark, I am thinking there is burnt carbon somewhere and maybe the Seafoam will clean it.
Any experienced suggestions or things I have missed? I appreciate it.
My employer brings his fishing boat to me, he sucked up sand through the jet drive and overheated the motor so bad that the thermostat was melted together with sand particles.The over temp sensor had the threaded plug melted off thats moot as it wasn't hooked up anyway, he says that he could not even get the motor to crank at one point and hand to haul boat upriver against current, not a good day for him. I suspect that it was heat resistance and a possible loose ground stud.
So early this morning I pulled the jet drive off to check the water pump, it was fine, we had it briefly running the day before and there was no tell tale stream. So I decided to first check compression, all three around 117-123, this was to just use for reference, I pulled the head off and found the water jackets filled and packed solidly with sand, I wadded up some shop towels in the cylinders and blew out all the sand. We are waiting for a thermostat right now but after putting everything back together the engine is hard to start and seems to have only half power, the VRO is disconnected and plugged, I picked up some Seafoam and am going to spray some into the engine after I get some throttle up, with the t-stat out right now I think the engine is way too cold to attempt and adjustments and right now does not want to run very well, too cold?
With the engine block getting so hot to melt a t-stat what else internally could be cooked? The rings appeared to be OK, no seizure or scuffing on the cylinder walls.
When I mean cold the engine is literally ice cold as its getting water from a huge plastic tank we have cut just for it, it holds over 200 gallons. But of course we are in Alaska and we have to order everything, no idea how long before t-stat shows up, I am thinking of making a temporary t-stat plug with a small bypass hole like 1/8th inch, just enough to circulate out an air pocket but holding water back to get engine up to an operating temp. Tomorrow I will hook up my Snapon timing light to each coil and see if I am lossing spark, I am thinking there is burnt carbon somewhere and maybe the Seafoam will clean it.
Any experienced suggestions or things I have missed? I appreciate it.
