RIN
Well-Known Member
Also
Blimey
This really does sound as if there is a serious design issue with a lot of boat engines!
Me Impeller got hot d*&m it!!
- Thread starter Mr Googler
- Start date
Also
Blimey
This really does sound as if there is a serious design issue with a lot of boat engines!
[2068]
...
Swings and roundabouts:
Strainer after the pump means that the strainer catches bits of impellor but also means that the strainer has water pressure in it = big leaks if strainer lid comes loose.
Strainer before the pump means that bits of impellor will go into the cooling system, but a loose strainer lid won't leak as much.
RIN
Well-Known Member
Yes I suppose there is something in that, but I am happier that we have the strainer after the impeller. The main danger the other way round I suppose would be not fitting the cap to the strainer correctly so that water leaks out and runs over the alternator. This did happen to a friend of mine at the cost of a new Alternator
omega2
Well-Known Member
lost a few impellers in the past, most bits go through the system, the big bits stick in the first "thing" in our case the intercooler, took one apart the other month (curious) found quite a bit of rubbish in the water intake side, and a finger tip in the air intake side. DONT ASK!!
PaulGooch
Well-Known Member
More importantly, strainer after the pump means any debris sucked into the system has to pass through the pump.
Strainer before the pump will not "leak as much" if the lid comes loose. It will draw air in and you'll lose the incoming water (if the lid is loose enough).
Nonetheless, still swings and roundabouts, unless we fit two strainers. Maybe a strainer before the pump and a course mesh after the pump to catch big lumps of impeller.
omega2
Well-Known Member
I would rather replace an impeller, than rebuild my cooked engine, so the answer is??
PaulGooch
Well-Known Member
Make sure the lid on my strainer is tight ?
Mr Googler
Well-Known Member
Bleedin Gimbal Bearing this time.
Well, after the impeller debarcle I had what sounded like a UJ knocking.
Took the leg off yesterday and it brought the Gimbal Bearing with it!!
Not good but all in one peice. UJ looks fine so new bearing on the way. I think what has happened is the leg was used slgihtly in the "trailer" tilt zone whilst negotiating some shallows
which made the UJ bind a bit (2 tiny marks on one of the yokes) This has then knocked the bearing loss and given me rattle.
Marine mechanic is coming round to check everything out
Im so glad I pulled the boat out asap or it could have been much worse.
A big thanks to Volvopaul who has been advising me throughout thank goodness!
Well, after the impeller debarcle I had what sounded like a UJ knocking.
Took the leg off yesterday and it brought the Gimbal Bearing with it!!
Not good but all in one peice. UJ looks fine so new bearing on the way. I think what has happened is the leg was used slgihtly in the "trailer" tilt zone whilst negotiating some shallows
which made the UJ bind a bit (2 tiny marks on one of the yokes) This has then knocked the bearing loss and given me rattle.Marine mechanic is coming round to check everything out
Im so glad I pulled the boat out asap or it could have been much worse.
A big thanks to Volvopaul who has been advising me throughout thank goodness!
[2068]
...
it's important to investigate knocking UJ's: an engine spinning at 3500rpm is spinning the UJ at the same speed - if it or the gimbal bearing lets go, it can all go wrong in a 'very big bill' kind of way
dragoon
Well-Known Member
I've had the same problem of late when bringing the boat ashore. I've also noticed that the sea water pumps are leaking. I suspect these are related issues as a leaking seal, will allow air to pass, and the pumps to lose their prime whilst ashore.
Any thoughts on this theory? It may be something to check in any case.
Cheers,
Paul
Any thoughts on this theory? It may be something to check in any case.
Cheers,
Paul