Hello all,

I am not in SOCAL (wish I was), but am still hoping for some west coast help on the east coast.  I have a (new to me) 73 CV-19 Glastron Carlson. I am a newbie on jets, although I've been around stern drives & outboards for half of my 52 years ....but this jet drive is a new animal to me.
 
This boat will idle all day on the trailer with a water hose connected at 160*. But when I put her in the water, and engage the jet drive at idle, it will peg the temp gauge at 220 after travelling maybe 200-300 yards at no wake speed to get out of the marina. When I get it up to 3000 to 3500 RPM's it will drop back to 180*. But if I idle it down to no wake speed to approach a dock....the temp hand pegs again FAST! It also puffs considerable steam (white smoke) out of the exhaust discharges when it's this hot approaching a dock.

 I have checked the compression twice, and it only varies by 20 lbs from hi to low (165 to 185lbs on Olds 455 with 425 "B" heads). I am running a CP Performance 180* marine t-stat. For the upcoming Memorial Day weekend, I am considering backing down to a CP 160* t-stat --or-- removing the t-stat and just running a Mondello reducing washer. I have had 3 new marine t-stats in her. I have replaced the water temp sending unit, and had 2 known good water temp gauges in her....all with the same result.

The Berkeley jet drive was rebuilt last year by the previous owner, so I don't think (hope) it's a water flow problem. This one has be stumped! Does it sound like a possible bad water pump on the engine? (it still uses the stock Olds engine water pump) But I don't see how...as it runs cool on a garden hose. I would think if it was a bad water pump, she'd run hot all the time. It's very much acting like a faulty or stuck t-stat. But what are the odds of 3 bad t-stats in a row?!! I'm also wondering if it's maybe a water flow issue <?> Any help on this will be VERY much appreciated!!  It really has me baffled!

Im curious to what your gate valve (if you have one) is set too as well, also how high are you turning your hose pressure up when you hook it to your motor?


Sent with my Fingers

On my olds, I only run a gate valve with -8 line in to the motor and -10 out.
The gate valve is only opened 3/4 turn from closed.

At 900rpm (idle) 0 lbs and 180 degrees
At 3200rpm 5-6lbs pressure and 150 degrees
At 5200rpm 12-13lbs at 140 degrees

There are many different ways to set the water lines up, this just happens to work for me.
Also I am not running water to my headers...


Sent with my Fingers

sorry new to your question but i have an olds you have a water pump??? have you talked to the old owner of the boat maybe it did it to him, and dare i say maybe its normal to your boat.

I run a 75 Carlson CV21 w/ a 468 @ about 580HP.  Get rid of the water pump, the JE pump on your ride provides (should) enough water flow with sufficient pressure to cool your engine.  Ditch the T-stat or drop it to a 160F with 3 1/16" holes drilled in it.  Get a pressure gauge on your set up, you've got to know what kind of flow/psi your running in the water. The pressure blow off valve works well, but you've got to set it with a gauge.  A gate valve set at 1-3/4 turns should be sufficient. I know the lakes your on, I grew up and ran on Buggs Island & Gaston, good deep water. 

I surmise the reason it runs adequately with the hose is the flow rate from your hose is making up for what the water pump can't do---it's shot.  I might also check the clearance on your impellar to the housing, it might be too much.  The previous owner may have done a quickie rebuild, i.e.- bearings, gland seals, maybe bowl bushings, and a gasket, depending on how froggy he felt.

Good luck!

I've had to make some changes to my set up that will cause another delay.  I've elected to go with KE Performance fully jacketed headers at a cost of around 3K.  The wife wants me to keep it all under the hood so she can climb her ass in and out over the aft end, I conceded.   Then there's the bathroom remodel (forced)-had a pipe blow out this cold winter and fucked everything that's costing me close to 10K.  And then there's my father- a retired SSBN commander, retired Naval Electronics VLF COmmunications engineer, retired private pilot, retired pro mod hydro racer........just diagnosed with agressive colon cancer.  I have to take some time off from everything to try and help get his affairs in order and help my step mother  .

Here's how the motor sits right now:

Thanks guys for all the help, and Chrisx2...sory to hear of your issues at the moment.  Take care of the family first! 

1. I am going to check all my lines this weekend for any plugging or debris.
2.  If al lines good....I am ditching the t-stat, and going with Mondello's reducing washer in place of t-stat.  Hopefully that will slow down the water enough to allow it to cool the block.
3.  I am installing an (on the way from e-bay) wter pressure guage 7 adjust my reduce valve to get 10-12 lbs with reducing washer in place of t-stat.
4. If all that suceeds in my hot idle cure.....I am going to remove the stock water pump this upcoming winter, and install a blocking plate and go with that & either a reduce washer or 160 t-stat next summer.

Thanks bunches....and good luck Chris!

Kelly