AQ130c - normal running temp and issues

[pcmpete]

My temp seems to be running higher than normal, after warm up and 5-10 wot run the temp goes up to 220-230 then back at idle it slowly drops to 200.
I did have a slight overheat issue the last time I took the boat out when the copper pipe from the water pump to the oil cooler came off at the oil cooler end and the temp went out to close to 260.

What is the normal running temp of the AQ130c?

Would the thermostat got damaged during th overheat?

The impeller is ok, because when the copper pipe came off it was pumping water into boat.

Any ideas/help?

Thanks

 

[Don S]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

Normal temp is around 185-190?.
After you pull and recheck the impeller and make sure it's ok.
Things to check would be a clogged up exhaust manifold, dirty heat exchanger, faulty thermostat, corroded hose connection on outdrive.
I would sure look at that hose connection and make sure the end didn't corrode off. It's a common problem on those drives. When at slow speeds, it's under water and will pull in water for cooling. At higher speeds (planing) the connection would be out of the water and the pump would be sucking air, not water.
It's just under the upper gear box where the ujoint bellows attaches to the drive.

 

[pcmpete]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

Normal temp is around 185-190?.
After you pull and recheck the impeller and make sure it's ok.
Things to check would be a clogged up exhaust manifold, dirty heat exchanger, faulty thermostat, corroded hose connection on outdrive.
I would sure look at that hose connection and make sure the end didn't corrode off. It's a common problem on those drives. When at slow speeds, it's under water and will pull in water for cooling. At higher speeds (planing) the connection would be out of the water and the pump would be sucking air, not water.
It's just under the upper gear box where the ujoint bellows attaches to the drive.

I will check all again tomorrow, the temp does not drop before 200 at idle with the boat not moving. Thanks

 

[captmello]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

According to OEM manual, thermo should be fully open at 153 deg. Don may have been thinking you have a aq131. You better check to make sure the gauge is accurate as well.

If you've never changed the intake fitting Don mentioned, that would be a good start. Just pull the hose off and have a look.

Let us know what you find.

 

[jerryjerry05]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

The Volvo's used real good paint on their manifolds.They still look new after 20 years.Remove the rubber boot and check for corrosion and clogs at the end.You might have to loosen the manifold.
The heat exchanger could be full of sand or mud.You run in fresh water so salt isn't a problem.If you run aground or beach these motors it clogs up the brass insert.It can be back flushed or even acid soaked.Go to a radiator repair shop for acid.
But my guess is the manifold is shot.Unfortunately it's real expensive.Osco manifolds are cheaper and just as good.

 

[captmello]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

Am I missing something? Is there a heat exchanger on a 130? Oil cooler, yes. Heat exchanger???

 

[Don S]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

Yes, I was thinking 131, not 130 when I posted, and no there isn't a heat exchanger on a 130, it's raw water cooled. It's an OHV engine, not an OHC.

 

[pcmpete]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

thanks for your replys.
Before my overheat the temp would start to drop as soon the boat slowed down. That is why I think something changed/got damaged during the 260 temp run.
My starting point will be to bypass the inlet hose from the outdrive to the raw water pump and connect the pump to a bucket and see what happens.

Can the water cooling system be 'back washed' in any way without removing items?

I don't want to take too many items apart if I don't need to, so I don't miss the 3 day weekend Hopefully it will either be the impeller or thermostat, fingers crossed.

 

[pcmpete]

Re: AQ130c - normal running temp -Recap and Update

Re: AQ130c - normal running temp -Recap and Update

Engine was running well, good power and idled about 750-800 (pertronix), no problems.
Copper pipe disconnect from oil cooler, resulted in 260 temp on the engine.

Since then:
it is very hard to start
will not idle at all
and the temp will not go down below 200.

This is what I have checked so far:

1. Checked raw water strainer, clear...

2. Back flushed from the strainer to the leg, clear

3. Checked the impeller, no sign of wear or cracks

4. Checked the thermostat with my trusty meal probe, starts to open at approx 120 and fully open by 145ish.

5. Pulled the plugs and turned the motor, no water in cylinders

6. Did compression test, only about 90 on each cylinder. (had good compression about the hi-temp run.)

7. Oil still looks good, not a milkshake in sight.

8. No external oil or water leaks


What do I do or look for next, before I start start surgery on this motor?

Thanks

 

[captmello]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

90 psi on all cylinders, not much life left there. I guess you could do a leakdown test and see where your losing compression. How long till your 302 is ready?

 

[pcmpete]

Re: AQ130c - normal running temp

Re: AQ130c - normal running temp

I didn't plan putting the 302 in until end of season, but looks like the end of season has come early.

Just got to get a new carb and tune the 302 before I swap the motors and outdrives.

 

[pcmpete]

Re: AQ130c - normal running temp and issues

Took the boat again today, the temp would go up to 200 when cruising at 2000rpm but when going 3000rpm or higher the temp would rise to 240 and not come down again. Is it possible that the thermostat can stick in the open or closed position?

 

[pcmpete]

Re: AQ130c - normal running temp and issues Update

Re: AQ130c - normal running temp and issues Update

Pulled the oil cooler end cap off to find about 1/2 dozen small acorn leaves in there

This is what probably caused the pressure to blow my copper pipe off.

I know how they got there, when I lived in California everytime I run the engine out of the water I connect the raw water pump directly to a horse watering troff via a piece of hose, by-passing my strainer. The troff is always full (auto filling valve like a toilet) and the water is never the clearest (poor horses) , and living on 15 acres will acorn trees everywhere.

I should have known better :redface:

Now I am in Arizona, no acorn trees to worry about, just sand/dust.

Checking and cleaning the oil cooler will be part of my impeller changing routine from now on.

Just thought I would share my findings..........

 

[captmello]

Re: AQ130c - normal running temp and issues

glad to hear it was something simple.

and the 130 lives on @90psi compression. It may outlive you, Pete.

 

[jerryjerry05]

Re: AQ130c - normal running temp and issues

Did the leaves cause the overheat??
From your description the manifold is clogged just enough to let it cool at slow speed but anything higher it won't flow enough to keep it cool.
The cam in the pump can do that too.Jerry

 

[pcmpete]

Re: AQ130c - normal running temp and issues

yes, removing the leaves solved my overhead issue

 

[jerryjerry05]

Re: AQ130c - normal running temp and issues

Good for you!!!J

 

[pcmpete]

Re: AQ130c - normal running temp and issues

I also used a temp gun and getting 127f at the temp sender and long idle
Temp gauge is approx 10 degrees out, but I still happy.