1999 Mercruiser 5.0 alpha one gen. 2. Bayliner Capri
Last fall I accidentally ran it for about 2-3 min. with no water. After doing that I decided to replace impellar. First try I didn't have it in forward gear when reassembled the lower, second try I left that damn "seating tool" for the shaft seal that goes over the impellar housing on and had the impellar fins backwards, third try I installed a whole new kit, gaskets...also, when I removed the impellar the first time (after running it dry) it looked great no pieces or scuffs. one of the times I ran it (with water) before I got the impellar installed correctly I had the temp gauge to 200 or more and steam was coming from riser manifolds joints. I also replaced the thermostat. So last fall I had a new 160 thermostat and impellar and it ran at 177 on the gauge. Before all that it ran around 165-170. I do have the shaft slinger seal that goes on top of the housing upside down...heard it doesn't matter though.
Got it out last week in the lake and got up to about 20mph (stopped because of the alternator chirp) then idled in water for a bit and it ran the same as fall except for Alternator was chirping, volt gauge was dead, still running at 177 on the gauge, risers and manifolds felt cool or warm.
Alright so I decided to look further into this. I removed risers and soaked in CLR then rinsed and cleaned gasket faces and replaced with new gaskets. No rust at all. Their was a little water in the bottom of the exhaust manifolds(not sure how it got their). Replaced alternator, fuel sending unit, gauges.
I also tested the new thermostat and it opened at 170 and fully opened at 180', tested temp. sender and it tested bad on ohms. I replaced thermostat and temp sender. All this to see if I could get it cooler.
---With infared gun the temp sender read 135ish the block read 158ish the port riser read 100ish the starboard riser read 117ish and the thermostat housing read in the 150s the new gauge read 177 all on muffs with water flowing.
My questions are:
1-Does it matter that I have the seal on top of the impellar housing on upside down?
2-Should I have done more to the risers than just soak and rinse and replaced gaskets on a clean surface( they were clean and rust free)? where does the water come out of the riser? I could see the large exhaust tube and it was clear but I didn't notice where the water would exit when I'd fill up the rectangular water passages?..
3-Is gauge reading 177 at idle or 1500 rpms while on muffs okay? Why 177 now but 165ish last year. Remember new gauge and other stuff and IR gun readings from above...I still haven't opened her up on water though
4-The new volt gauge reads 16-17 volts but the wires on back of gauge read 14.4 with my meter. Another bad gauge I'm assuming.
5-15 degree risers temp difference. Still both cool or warm though?
Last fall I accidentally ran it for about 2-3 min. with no water. After doing that I decided to replace impellar. First try I didn't have it in forward gear when reassembled the lower, second try I left that damn "seating tool" for the shaft seal that goes over the impellar housing on and had the impellar fins backwards, third try I installed a whole new kit, gaskets...also, when I removed the impellar the first time (after running it dry) it looked great no pieces or scuffs. one of the times I ran it (with water) before I got the impellar installed correctly I had the temp gauge to 200 or more and steam was coming from riser manifolds joints. I also replaced the thermostat. So last fall I had a new 160 thermostat and impellar and it ran at 177 on the gauge. Before all that it ran around 165-170. I do have the shaft slinger seal that goes on top of the housing upside down...heard it doesn't matter though.
Got it out last week in the lake and got up to about 20mph (stopped because of the alternator chirp) then idled in water for a bit and it ran the same as fall except for Alternator was chirping, volt gauge was dead, still running at 177 on the gauge, risers and manifolds felt cool or warm.
Alright so I decided to look further into this. I removed risers and soaked in CLR then rinsed and cleaned gasket faces and replaced with new gaskets. No rust at all. Their was a little water in the bottom of the exhaust manifolds(not sure how it got their). Replaced alternator, fuel sending unit, gauges.
I also tested the new thermostat and it opened at 170 and fully opened at 180', tested temp. sender and it tested bad on ohms. I replaced thermostat and temp sender. All this to see if I could get it cooler.
---With infared gun the temp sender read 135ish the block read 158ish the port riser read 100ish the starboard riser read 117ish and the thermostat housing read in the 150s the new gauge read 177 all on muffs with water flowing.
My questions are:
1-Does it matter that I have the seal on top of the impellar housing on upside down?
2-Should I have done more to the risers than just soak and rinse and replaced gaskets on a clean surface( they were clean and rust free)? where does the water come out of the riser? I could see the large exhaust tube and it was clear but I didn't notice where the water would exit when I'd fill up the rectangular water passages?..
3-Is gauge reading 177 at idle or 1500 rpms while on muffs okay? Why 177 now but 165ish last year. Remember new gauge and other stuff and IR gun readings from above...I still haven't opened her up on water though
4-The new volt gauge reads 16-17 volts but the wires on back of gauge read 14.4 with my meter. Another bad gauge I'm assuming.
5-15 degree risers temp difference. Still both cool or warm though?