Airscrew
Well-Known Member
I see the other similar thread today, but this is a little different.
Relatively new, low hours DV24.
Engine not familar (yet) to me, as we had a Volvo MD11 before.
Have the workshop manual.
Raw water cooled.
New water pump last year.
Normal flow is gushing, almost continous at bruising revs.
Sailed some weeks ago, but only used the engine for (2) short periods, and so didnt notice a problem.
Today I guess the flow was 1/4 normal.
Stopped to investigate before exiting the river (Hamble), en-route to a week away on the boat - now postponed
Checked and resealed the water filter.
Poked the through hull fitting.
Pulled the 'out' pipe from the pump. ran the engine briefly, good flow.
Pulled the impeller anyway. As I expected, looks new, with no wear on the cover. Replaced with new.
Still limited flow from the exhaust, but enough to get back up river to the berth.
Temp warning didnt go off.
So I'm thinking internal blockage.
Yes??
Per the other thread, and my thoughts on the boat,
either the feed into the block behind the flywheel, or the thermostat.
Q.
Which of those is more likely, and why (which to chec k first).
Q.
What size alllen key needed behind the flywheel.?
Kicking myself for not checking while on the boat.
And by how much roughly do I need to grind it down (shorten) for the difficult one of the two.
Q.
How do I clean it?.
Is water and a wire brush OK?
Q.
Will I need a new seal.?
If so, where is the best place to get one at short notice?
If I need to seal it quickly, would you recommend an instant gasket, and if so what type for that location on the engine?
Q.
Should I replace the thermostat anyway?
Any other thoughts.??
Many thanks.
Relatively new, low hours DV24.
Engine not familar (yet) to me, as we had a Volvo MD11 before.
Have the workshop manual.
Raw water cooled.
New water pump last year.
Normal flow is gushing, almost continous at bruising revs.
Sailed some weeks ago, but only used the engine for (2) short periods, and so didnt notice a problem.
Today I guess the flow was 1/4 normal.
Stopped to investigate before exiting the river (Hamble), en-route to a week away on the boat - now postponed
Checked and resealed the water filter.
Poked the through hull fitting.
Pulled the 'out' pipe from the pump. ran the engine briefly, good flow.
Pulled the impeller anyway. As I expected, looks new, with no wear on the cover. Replaced with new.
Still limited flow from the exhaust, but enough to get back up river to the berth.
Temp warning didnt go off.
So I'm thinking internal blockage.
Yes??
Per the other thread, and my thoughts on the boat,
either the feed into the block behind the flywheel, or the thermostat.
Q.
Which of those is more likely, and why (which to chec k first).
Q.
What size alllen key needed behind the flywheel.?
Kicking myself for not checking while on the boat.
And by how much roughly do I need to grind it down (shorten) for the difficult one of the two.
Q.
How do I clean it?.
Is water and a wire brush OK?
Q.
Will I need a new seal.?
If so, where is the best place to get one at short notice?
If I need to seal it quickly, would you recommend an instant gasket, and if so what type for that location on the engine?
Q.
Should I replace the thermostat anyway?
Any other thoughts.??
Many thanks.
