Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

[saffi]

I have a johnson 25 HP (j25balcnb, s/n b01677)<br /><br />From the serial and model number I take it to be a 1982 belgium model. Here's the problem:<br /><br />I want to replace the water pump, thermostat and add a rectifier to charge my battery. According to the Sierra catalog (and numourous other sites) I need the complete waterpump kit #18-3383 (repair kit for outboard # 395270) When I look at the picture however I can see a different set from what I can remember (six screws) when I last checked the impeller. I think I need the other set (18-3382) The Seloc (volume 2, section 8 page 111) also shows a six screw water pump housing for the 25-35 mechanical shift models. How can this be? Are there '82 models with '84 and later specs? Is this just an error in the (Sierra)catalog? I still run my boat frequently and can't take it apart at the moment. Also, since I live in europe and order the parts from the US (prices here are incredible)returning the parts is no option. <br /><br />One more question if I may; Do I need the four or the three wire rectifier? (5709 or 5708) And is it just the rectifier I need to charge the battery from the external power source?<br /><br />Thanx in advance, Lucas

 

[rickdb1boat]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

This looks like a 4 Screw kit:<br /><br /> web page<br /><br />This crosses to the 18-3383, according to my book and it shows it being a 4 bolt kit. It actually says it comes with 4 screws, so it's got to be the right kit number.

 

[saffi]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

That's the problem, Sierra and also the site you mentioned say # 3383 is the proper replacement for my '82 johnson. Seloc however (and my recollection from the last time I serviced the engine) shows the six screw # 3382. I guess I'll have to take my engine from the boat and have a look. It's a shame as I use it to go to work and ordering will take about four weeks. I was hoping someone knew.

 

[rickdb1boat]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

I would pull the lower unit and make sure of what you have. Seloc mauals are notorious for being wrong on some things. Find out for yourself and you will know for sure what you need. Your memory is probably correct, as this is what every source I have says it should be.<br /><br />By the way, the 35 HP model does show the 6 bolt pattern. Pump # 18-3382, so I think you've got it right with the 18-3383 kit..

 

[Joe Reeves]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

Lucas, Your engine, model #J25BALCNB requires the following items if the engine has all original components, including the lower unit. I'll list the original OMC numbers, followed by any OMC superceeded numbers, then followed by the Sierra equivalent number.<br /><br />Water Pump (4 Screws) - 389611 - 394394 - 395271 - 395270 - - - Sierra #18-3383<br /><br />Thermostat - 378065 - 393659 - 437414 - 434841 - - - Sierra #18-3553<br /><br />Rectifier (4 Wire) - 581778 - - - Sierra #18-5709<br /><br />Your post is somewhat confusing as it appears that you think the water pump is attached to the lower unit by six (6) screws?<br /><br />If your water pump indeed is attached with six (6) screws, then the lower unit has been changed to a later model. The 1985 and later 20hp and 25hp models do incorporate a six (6) screw water pump assy.<br /><br />In which case (6 screw) the OMC number would be 393630 - - - Sierra #18-3382

 

[saffi]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

It was confusing to me since I remember six screws... I re-read the Seloc section and discovered it covers the 25hp models '86 onwards and the 35hp 1974-84. Not the 25hp '82 model. That could explain the six screw pump housing on the picture. Someone told me the 35 and 25HP models were identical apart from the carburetor. I guess the pump housing could also be different. Maybe the lower unit was replaced, I bought it last year. I know now I need to check. Too bad. Thanks for all the help.<br /><br />ps. Do I need just the rectifier to charge a battery or do I need an extra voltage regulator?<br /><br />thanx

 

[rickdb1boat]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

I might be mistaken, but I thought you remembered 4 screws on the pump. Also, this is why Factory Manuals are the best...

 

[saffi]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

You are right, I edited the post as it was confusing. Sorry, not a native speaker and I got the numbers the wrong way 'round. <br /><br />thnx, Lucas

 

[rickdb1boat]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

The Sierra #18-3383 is the correct kit....

 

[alcan]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

Hi saffi<br />As to the question of the water pump. My info shows two different lower units available. A through hub exhaust model and a non-through hub exhaust. The non-through hub exhaust was used on the commercial model motors. This l/u uses the four bolt pump housing. The through prop (hub) model uses the six bolt housing. This confusion is common with OMC motors made overseas. They all use the same parts as U.S models, just different combinations. I run into the same problem here in the states with commercial model motors. I don't under stand your question about the charging system. The rectifier you need is the four wire model.

 

[G DANE]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

A 1982 25Hp belgium made motor will not have thru-hub exhaust and will use the 4 screw pump.<br /><br />I have a 1984 25Hp sitting waiting for a good lower unit to show up, is hasnt thru-hub exhaust and it uses the 4 screw pump too. 35Hp from 1981 will use 6 screw pumps, but they have thru-hub. the 25 and 25 Powerheads are identical apart from intake housing. 35HP uses a complete different mid-section, lowerunit with thru-hub exhaust and later than 1984 a different carb.

 

[saffi]

Re: Wrong part numbers johnson 25 HP (j25balcnb, s/n b01677)

The engine doesn't have a thu-hub exhaust so the 4 screw kit seems the coorect one (as all the info suggests) If I do have a six screw pump housing I'll let you know. It would be an exotic mixture of parts wouldn't it?<br /><br />About my rectifier question:<br /><br />I want to charge my battery. As I understand it the rectifier just coverts the current from A/C to D/C and prevents the current flowing back from the battery. Wouldn't I need a voltage regulator to keep the current at about 14 volts to properly charge the battery? I thought the voltage varies with the RPM of the engine and this could be bad for charging.<br /><br />thnx, Lucas