Thelumberwagon
Cadet
- Joined
- Apr 14, 2011
- Messages
- 8
I have a 1998 Volvo Penta 4.3GL with an SX outdrive (I know Don S suggested including engine model numbers but I can decipher them due to fading) in a Regal 2100 LSR that I just bought. I changed the impeller as a precaution since I didn't know the history. Upon using the hose to "bench test" it before hitting the lake, I noticed the left riser was considerably warmer than the right and that the elbow showed previous signs of excessive heat (left being my left when looking back at the motor from inside the boat). The temp guage never indicated any overheat so we hit the lake last night for the maiden voyage. We were running 50-55 mph with no issues. Stopped to see how things were doing and could smell a slight burning. Couldn't find the source of the smell so we headed toward the ramp. Took another break and the smell was stronger so we knew something was going on. A bit further and there was confirmed smoke coming off the left elbow coming off the riser (the riser was hot but not smoking, just the elbow). Needless to say, it was cookin. We let it cool and limped back to the dock. BTW....no high readings on temp guage and the engine was actually running quite well. After sitting for about 20 minutes we experienced a hyrdrolock. Once home I noticed that the rubber boot that connects the riser to the elbow was damaged. It was almost like it was unhooked but it wasn't, similar to being cut right around where the elbow would be inside the boot. I cannot confirm that this was a result of the heat or if it was like this before we headed out and caused the heat due to an air leak.
So....here is my question/s.
1.Can someone explain the anatomy of a riser and how a failure would allow a hydrolock?
2. What would cause the elbow to get so hot (I know lack of water flow....but specifically what type of blockage?)
3. What are the chances that I have caused permanent damage to my engine?
4. Would a bat T-stat cause these symptoms?
5. Would a faulty boot create enough of an air leak to cause the symptoms I've detailed?
I've got plenty of experience with OB's but I'm new to the I/O scene. I've read where riser height is of concern but this is all factory set up and really don't think that's an issue for me. Furthermore, I've read posts that indicate that riser/manifold replacement is part of "routine" maintenance. This is a freshwater boat that has always lived in KS so no saltwater issues to contend with.
Any guidance or tips are certainly welcome.
Thanks
So....here is my question/s.
1.Can someone explain the anatomy of a riser and how a failure would allow a hydrolock?
2. What would cause the elbow to get so hot (I know lack of water flow....but specifically what type of blockage?)
3. What are the chances that I have caused permanent damage to my engine?
4. Would a bat T-stat cause these symptoms?
5. Would a faulty boot create enough of an air leak to cause the symptoms I've detailed?
I've got plenty of experience with OB's but I'm new to the I/O scene. I've read where riser height is of concern but this is all factory set up and really don't think that's an issue for me. Furthermore, I've read posts that indicate that riser/manifold replacement is part of "routine" maintenance. This is a freshwater boat that has always lived in KS so no saltwater issues to contend with.
Any guidance or tips are certainly welcome.
Thanks