Water leaks - Rubber seals

dwleo

Cadet
Joined
Jul 10, 2012
Messages
18
Hi all,
Newbie here running into a brick wall with my boat.
I have an AQ170C in-line 6 cylinder with 280 drive. I recently acquired this boat and was warned about overheating. I removed the intake/exhaust manifold and ensured it was clear in the water jackets. I replaced the circulating water pump and, after also replacing some corroded wiring got it fired up. Ran great but as I watched the temp gauge, it was rising very quickly. I also had some water leaks where the various coolant pipes fitted into the water pump and the exhaust manifold. I had replaced these with new seals but still leaked. Also saw leaks at the thermostat housing where it joins through to the waterpump.
So, I fixed the overheating (thanks to a tip on this forum that worked extremely well) but am problemed by these rubber seals and getting them to seal. Also in my manual it states that when replacing the thermostat and rubber seal, the thermostat MUST be installed with the seal against the block. I also have an exploded view which shows the thermostat against the block.
5104.jpg
Which is correct?

I cannot, for the life of me, get the seals to seal where the water pump attaches.
All in all, of the over 8 rubber sealing rings, only two are actually sealing. I suspect this is by dumb luck only. Is there a great, huge secret to properly install these rings? Should I use a compound with them? I have had these on and off several times and have replaced them numerous times without success.
I would appreciate any and all help.
Thank you.

- Daryl
 

diesel1960

Petty Officer 1st Class
Joined
Jul 3, 2012
Messages
205
Re: Water leaks - Rubber seals

I have AQ170 ,working good after I overcome all the problems.
Thermostat is easy ,you must have wrong gasket (Volvo penta # 416033) it fits over thermostat edge, so it seals between block and upper housing.
For the pump use new seals #831617 and make sure the ring retainers #423187 aren’t missing.
 

diesel1960

Petty Officer 1st Class
Joined
Jul 3, 2012
Messages
205
Re: Water leaks - Rubber seals

Also make sure surfaces between the pump and pipes connector are flat and free of scars
 

dwleo

Cadet
Joined
Jul 10, 2012
Messages
18
Re: Water leaks - Rubber seals

I have AQ170 ,working good after I overcome all the problems.
Thermostat is easy ,you must have wrong gasket (Volvo penta # 416033) it fits over thermostat edge, so it seals between block and upper housing.
For the pump use new seals #831617 and make sure the ring retainers #423187 aren?t missing.

Thank you for your reply.
I have that gasket (416033) it came with the thermostat. Did not notice that it fitted over the lip that way. I'll check that when I go back to the boat. I received seals 831617 but ring retainers? Didn't even see that in the diagrams or manual.
 

dwleo

Cadet
Joined
Jul 10, 2012
Messages
18
Re: Water leaks - Rubber seals

That tube did not come off and I doesn't leak. As well, I believe it is the only one with a retainer.
Could I use a compound (gasket) on the rings to help seal it?
 

diesel1960

Petty Officer 1st Class
Joined
Jul 3, 2012
Messages
205
Re: Water leaks - Rubber seals

You need one retainer and o-ring for both pipes(water intake to pump and water outlet to engine)
If is done properly will not leak.
Not sure if I would recommended gasket maker-seal,there is not much of the contact area to seal, AQ170 pump may boost up to 20psi at high RPM,also you do not need any air leak at the intake side.
 

dwleo

Cadet
Joined
Jul 10, 2012
Messages
18
Re: Water leaks - Rubber seals

I wonder why that is not shown in the exploded diagram nor in the manual?
 
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