PDA

View Full Version : '98 Prostar 205 Overheating


waterprincess
08-26-2007, 01:34 PM
Out on the boat yesterday we started having an issue with smoke exiting from the exhaust pipes at the end of the boat. The temperature was high. We shut the boat off, let it cool ... continued to drive and it was fine. The second we started pulling a wakeboarder the temperature went high and started to smoke again.

We've checked the oil and transmission fluids, they are fine. Trying to locate the coolant area or an easy way to test if something was sucked in to the intake area ... any ideas! Please help as we'd like to take the boat out again today! :confused:

corey
08-26-2007, 01:48 PM
Two things to check.

1. Impeller, located on the front of the engine. Will be a small housing with 4 screws holding a plate on the housing. You will need a needle nose pliers to pull the impeller out. If any blades are broken or missing you NEED to replace the impeller. Easy way to avoid this is to replace the impeller every fall, inspect it at a minimum.

2. Tranny cooler. You may have sucked some debris into the system and it is stuck in the tranny cooler. Remove the hose from the bottom of the cooler and pull out any debris with your fingers.

waterprincess
08-26-2007, 02:00 PM
Thanks Corey!

This may sound like a stupid question but where can we find the tranny cooler? Is it between where the water comes in and the impeller?

Thanks ... we really appreciate it!

bigmac
08-26-2007, 02:10 PM
The transmission cooler is usually located between the raw water pump output and the engine....first structure after the raw water pump.

There is a strainer on the raw water pump side of the transmission cooler. The easiest thing to check first is that - pulling the RW-pumpside hose off and sweeping around in there with your fingers for weeds or other debris. If, in doing so, you find little rubber pieces, it usually means that the impeller has shredded and will need to be changed. If you find nothing in the tranny cooler strainer, or if clearing it doesn't help the overheating, then next step is pulling the impeller and checking it. And if you're pulling it, you might as well replace it for the $30 that that will cost.

waterprincess
08-26-2007, 02:16 PM
Would a Schucks or a Napa have an impeller or do we need to go to a boat repair shop? Will they carry an impeller for a 1995 boat or will we need to order?

Sorry we're just trying to determine if we can take the boat out today!

Thanks for the help Big Mac!

bigmac
08-26-2007, 02:35 PM
Not sure what raw water pump a 95 or 98 Prostar uses, but likely a Johnson...like this?

http://www.skidim.com/images/joh10-24232-1.jpg

In which case it will need a pretty standard Johnson 812 impeller (http://www.skidim.com/prodinfo.asp?number=RP061018). That won't be available at an auto parts store, but it's likely something that any MasterCraft, Malibu, or Supra dealer will have readily on hand.

Note that if you have an LT-1 engine you may have a Jabsco pump instead of a Johnson and this might not be the right impeller.

east tx skier
08-27-2007, 12:57 AM
The transmission cooler is usually located between the raw water pump output and the engine....first structure after the raw water pump.

There is a strainer on the raw water pump side of the transmission cooler. The easiest thing to check first is that - pulling the RW-pumpside hose off and sweeping around in there with your fingers for weeds or other debris. If, in doing so, you find little rubber pieces, it usually means that the impeller has shredded and will need to be changed. If you find nothing in the tranny cooler strainer, or if clearing it doesn't help the overheating, then next step is pulling the impeller and checking it. And if you're pulling it, you might as well replace it for the $30 that that will cost.

The screen ought to be on the hull side of the transmission cooler.

If you determine that your impeller was toast, you may want to pull the high hoses, i.e. tstat and manifold hoses and flush them out to see if you've got little bits of impeller in there. My father-in-law's 98 205 overheated and we spent a good deal of time back flushing the little bits out. After that, a new impeller and it was good to go.

waterprincess
08-27-2007, 01:40 AM
This is all absolutely awesome ... we took the impeller off and flushed the pieces out, bought a new one at the local Mastercraft dealer ($34.99 - not too bad!) ... let's just say the impeller was LONG overdue for a change. We are taking it out this Friday and hopefully we'll be all set! Thanks for all the help!

pdiprete
08-27-2007, 02:04 AM
You're lucky you didn't ingest little pieces of rubber in the engine. That can be tricky to fix and will continue to plague you with odd over heating problems.

Like you said, $35. Cheap maintenance.