ConchPirate
Seaman
- Joined
- Jul 20, 2011
- Messages
- 52
VP 5.0GXi-E/SX-M outdrive
Due to an overheating issue (port engine only @ idle/low speeds) with a brand new water pump installed I took advantage in another post here to narrow down the problem to the water intake line problem. I connected the port engine pump intake to the STBD engine supply line and the engine ran with zero overheating issue at all (video link with IR gun measurements available). The manifolds and risers never got above 120F. Let it sit dockside at idle for almost 45 minutes and it never did overheat.
Reconnect the port engine normal water intake line and the manifolds seem to overheat (going to temps of 150 and climbing fast) within 3 minutes! Yikes. Because of the suggestions of cracked hose fittings and potential of drawing in air, I pulled the pump intake line and connected a garden hose directly into the intake line to backflush. I'm thinking that if air can get in (cracked fitting/loose clamps as suggested) then water under pressure can get out. While the water was back flushing I did some video watching for leaks in areas other than the water intake ports on the lower unit. Didn't see any other leaks along the line either inside or outside. I also ran the same test on the STBD engine line to compare output flow and it doesn't seem to be significantly different. Perhaps someone here sees a difference I don't in the video links.
Based on the picture of a new oil cooler I cant see that it would become so blocked up that it would restrict the water flow that significantly. Am I wrong on that thought? Does the 1" bore get that clogged up over the years?
Any other thoughts on what test to do next to figure this out are very welcome! And TIA folks. I'm thinking maybe block off the lower unit intake ports with some duct tape and fill the intake line with barnacle buster or similar for a couple hours.
https://youtu.be/el6Qu5LRvCw
https://youtu.be/yvhJyiAdWwk
Due to an overheating issue (port engine only @ idle/low speeds) with a brand new water pump installed I took advantage in another post here to narrow down the problem to the water intake line problem. I connected the port engine pump intake to the STBD engine supply line and the engine ran with zero overheating issue at all (video link with IR gun measurements available). The manifolds and risers never got above 120F. Let it sit dockside at idle for almost 45 minutes and it never did overheat.
Reconnect the port engine normal water intake line and the manifolds seem to overheat (going to temps of 150 and climbing fast) within 3 minutes! Yikes. Because of the suggestions of cracked hose fittings and potential of drawing in air, I pulled the pump intake line and connected a garden hose directly into the intake line to backflush. I'm thinking that if air can get in (cracked fitting/loose clamps as suggested) then water under pressure can get out. While the water was back flushing I did some video watching for leaks in areas other than the water intake ports on the lower unit. Didn't see any other leaks along the line either inside or outside. I also ran the same test on the STBD engine line to compare output flow and it doesn't seem to be significantly different. Perhaps someone here sees a difference I don't in the video links.
Based on the picture of a new oil cooler I cant see that it would become so blocked up that it would restrict the water flow that significantly. Am I wrong on that thought? Does the 1" bore get that clogged up over the years?
Any other thoughts on what test to do next to figure this out are very welcome! And TIA folks. I'm thinking maybe block off the lower unit intake ports with some duct tape and fill the intake line with barnacle buster or similar for a couple hours.
https://youtu.be/el6Qu5LRvCw
https://youtu.be/yvhJyiAdWwk