Hi,
I have a 1978 35 hp seahorse model # 35852R. I think I broke it and need some advice. Here's the details. I appreciate any advice.
I noticed some white smoke after running at high RPMs. Nothing crazy but I thought it might indicate a problem. It was running well other than the white smoke. I consulted a friend who said to check compression and lent me his compression tester. Put it in, turned the key. It cranked then stopped. Turned out his compression tester had too long a shaft and the piston hit the threads and messed them up. When I backed it up it messed up the spark plug threads. I noticed some metal shavings where threads were damaged and carefully removed them. Then I put the plug in gave it a turn, removed shavings, repeat until all the way in and I was confident all metal shavings were removed. Fixed the threads on compression tester and both cylinders had a compression of 110. Put the plugs back in and ran for 10-15 minutes. Everything seemed fine. Next time out on the water, after fishing for a couple hours (running engine periodically) I noticed it was running a little slow (seemed perfect all day prior). Came off plane and it killed. After a bunch of tries got it started and tried to get back to the dock but it died again and wouldn't start. Got home and tested compression again. 40 on cylinder with damaged threads (and possibly some indication of water in the head) and 90 on the good cylinder. I am hoping it is losing compression due to the damaged threads. Any thoughts? My plan was to remove the head, check for damage on the walls of the cylinder, and if there is none repair the threads with a helicoil or similar product. I tried to remove the head (I am hoping to do so without pulling powerhead). All the bolts came out fine but it won't budge. I have not removed the cylinder head cover. Are there more bolts hidden under there or is it just stuck on because it hasn't been removed for 30 years? What do I do next?
Thanks for any advice and for taking the time to read this.
Pat.
I have a 1978 35 hp seahorse model # 35852R. I think I broke it and need some advice. Here's the details. I appreciate any advice.
I noticed some white smoke after running at high RPMs. Nothing crazy but I thought it might indicate a problem. It was running well other than the white smoke. I consulted a friend who said to check compression and lent me his compression tester. Put it in, turned the key. It cranked then stopped. Turned out his compression tester had too long a shaft and the piston hit the threads and messed them up. When I backed it up it messed up the spark plug threads. I noticed some metal shavings where threads were damaged and carefully removed them. Then I put the plug in gave it a turn, removed shavings, repeat until all the way in and I was confident all metal shavings were removed. Fixed the threads on compression tester and both cylinders had a compression of 110. Put the plugs back in and ran for 10-15 minutes. Everything seemed fine. Next time out on the water, after fishing for a couple hours (running engine periodically) I noticed it was running a little slow (seemed perfect all day prior). Came off plane and it killed. After a bunch of tries got it started and tried to get back to the dock but it died again and wouldn't start. Got home and tested compression again. 40 on cylinder with damaged threads (and possibly some indication of water in the head) and 90 on the good cylinder. I am hoping it is losing compression due to the damaged threads. Any thoughts? My plan was to remove the head, check for damage on the walls of the cylinder, and if there is none repair the threads with a helicoil or similar product. I tried to remove the head (I am hoping to do so without pulling powerhead). All the bolts came out fine but it won't budge. I have not removed the cylinder head cover. Are there more bolts hidden under there or is it just stuck on because it hasn't been removed for 30 years? What do I do next?
Thanks for any advice and for taking the time to read this.
Pat.
