|
| 1985 25hp Mariner cuts out after appr... |
| Author |
Message |
    
Bill Weistroffer
New member
Username: billwww
Post Number: 2
Registered: 06-2008
| | Posted on Friday, June 20, 2008 - 06:29 pm: | 
|
I just had my carb rebuilt, with a new float and I also replaced a stuck-open thermostat. Previously, the engine would over heat and was hard to start. Starting in now no problem. The repair shop showed no obstruction in the cooling. But, after I got the engine back from the shop and put back on the boat, have noticed that after 5-10 minutes, steam starts to come from the lower unit. The previous owner had the water pump replaced on 2005, if that means anything. Also noticed that when the engine cuts out, the bulb in the fuel line gets soft. When I pump it up while the engine is running, the engine starts to run smoother, but only for a few seconds, until it begins to stop again. Have noticed when I replaced the thermostat, the small chamber that the stat sits in does not seen to have any openings under the stat. Is the water supposed to run thru the stat? I need my motor before winter comes.
HELP |
Graham Lamb
Senior Member
Username: galamb
Post Number: 3447
Registered: 05-2007
| | Posted on Friday, June 20, 2008 - 11:16 pm: |
|
Bill, the waterpump impeller is due for a change again and pumping the bulb and having it "come back to life" indicates a bad fuel pump.. |
Bill Weistroffer
New member
Username: billwww
Post Number: 3
Registered: 06-2008
| | Posted on Saturday, June 21, 2008 - 08:45 am: |
|
Graham, thanks for the information. I know how to remove the fuel pump, but is it a big job to repair the waterpump? I know the lower unit must be removed, is there a step-by-step instruction available somewhere? |
Graham Lamb
Senior Member
Username: galamb
Post Number: 3449
Registered: 05-2007
| | Posted on Saturday, June 21, 2008 - 08:59 am: |
|
Bill pulling the lower and replacing an impeller etc is a fairly easy job. But as you elude to, it is a series of steps.
It really is best to grab a Seloc's manual for your model. 35 bucks for the book can save hundreds in case of an "oops"... |
Bill Weistroffer
Member
Username: billwww
Post Number: 4
Registered: 06-2008
| | Posted on Thursday, June 26, 2008 - 05:50 pm: |
|
Thank you Graham for all your help.
I replaced the water pump impeller, and found that the old one looked as good as the new one. I replaced it anyway. The engine starts quickly, runs well at idle, slow and medium. The water flow from all ports looks good when running slow and medium, but when I open up full, the water spout from the bottom of the engine housing, reduces to a dribble and then turns to steam. Also, steam comes from the exhaust.
If I reduce speed to slow or idle, the water stream returns to normal and the steaming stops.
When steaming, the engine does not run rough, but I am afraid of what could happen.
What do you think? |
Graham Lamb
Senior Member
Username: galamb
Post Number: 3523
Registered: 05-2007
| | Posted on Thursday, June 26, 2008 - 08:01 pm: |
|
Bill, that definately indicates a problem. The steam means it isn't getting enough water to the powerhead and it's overheating.
Since the impeller was in good shape the problem definately lies elsewhere.
What was the condition of the water cover gasket? the seal at the top of the water cover where the water tube enters? possibly a hole in the water tube itself (have seen it) - seal where the water tube enters the exhaust plate up near the powerhead could be shot.
It sounds like somewhere between the impeller and the powerhead you are "leaking water". I suspect that when the impeller is turning at lower rpm the leak is not severe enough to impede the water getting where it needs to go but as soon as you crank it up you are losing enough that it can no longer cool things down.
You have done the easy fix, which was the way to go, unfortunately it wasn't the problem. You are most likely going to have to pull the powerhead and separate the exhuast housing (leg) to ensure everything is intact.. |
|
|
|
Product Categories |
| Engine Parts · By Brand |
| Engine Manuals · By Brand |
| Books |
| General Repair and Maint. |
| Care and Repair |
| · Adhesive and Sealants |
| · Bottom Cleaners |
| · Cleaners Wax and Polish |
| · Mops Brushes and Sponges |
| Covers and Tops |
| · Bimini Tops · Hardware |
| · Cover Accessories |
| · Motor Covers |
| · Universal Boat Covers |
| Electronics |
| · Gauges and Compasses |
| · Mounts and Accessories |
| Electrical |
| · Batteries & Chargers |
| · Battery Accessories |
| · Dockside Electrical |
| · Electrical Terminals |
| · Electrical Wire, Cable |
| · Fuses, Fuse Holders |
| · Switches |
| · Wire Ties, Clips, Tape |
| Fuel Systems |
| · Fuel Tanks |
| · Fittings, Fills, Vents |
| · Hose & Primer Bulbs |
| · Filters, Senders, Caps |
| Hardware |
| · Deck Cabin Hardware |
| · Molding and Rub Rails |
| · Rails and Fittings |
| · Snaps Shackles and Hooks |
| · Windshield Hardware |
| Lighting |
| · Cabin Lights · Light Bulbs |
| · Navigation Light Parts |
| · Navigation Lights |
| · Spotlights · Parts |
| Mooring and Dock |
| · Boat Fenders · Boat Hooks |
| · Buoys and Markers |
| · Deck Cleats · Dock Edging |
| · Dock Parts and De-Icers |
| · Fender Covers and Holders |
| · Keelshield / Toon-Tectors |
| · Ladders and Platforms |
| Prop / Trim /
Transom |
| · Jack Plates, Wedges |
| · Mounting Brackets |
| · Outboard Stands |
| · Trim Tabs, Stablizers |
| · Prop Nuts, Locks, Pins |
| · Propellers · Wrenches |
| Pumps |
| · Aerator Pumps |
| · Bilge Pumps |
| · Drain Plugs and Tubes |
| · Hose · Through Hull Fittings |
| Rope and Cordage |
| · Anchor Line · Dock Line |
| · Fender Line · Bulk Rope |
| · Shock Cord and Bungee |
| Safety Products |
| · Horns Bells and Whistles |
| · Mirrors |
| · Vents Blowers and Hose |
| Sanitation |
| · Fresh Water Pumps |
| · Marine Toilets |
| · Sanitation Chemicals |
| · Sanitation Pumps/Hose |
| · Water/Waste System Parts |
| Seating |
| · Deck Chairs and Tables |
| · Fishing Seats |
| · Lounge Seats |
| · Pontoon Furniture |
| · Seat Bases and Pedestals |
| Steering / Control |
| · Control
Boxes |
| · Control
Cables |
| · Hydraulic
Steering |
| · Mechanical
Steering |
| · Rigging · Steering
Wheels |
| Tools / Shop Supplies |
| · Lubricants & Additives |
| · Motor Flushers |
| · Tools & Test Equipment |
| Trailering |
| · Boat Guides/Motor Support |
| · Hitches Balls Couplers |
| · Rollers Brackets Springs |
| · Tires Wheels and Carriers |
| · Trailer Hubs & Bearings |
| · Trailer Jacks |
| · Trailer Wiring and Lighting |
| · Winches Straps Tie Downs |
| Manufacturer List |
|
