|
| How to bleed air from a 2QM15 (Bosch)... |
| Author |
Message |
    
Paul Brogger
New member
Username: broggerp
Post Number: 3
Registered: 10-2007
| | Posted on Monday, October 08, 2007 - 01:00 pm: | 
|
I've got fuel getting as far as the injector pump, but nothing coming out. This after dirty fuel ran into the system. I've cleaned everything up (tank, diesel, filter-separator, lines -- the works) and installed new filters.
Peter Compton's book suggests I "follow the service manual's instructions" on bleeding air from the pump. But neither the Yanmar service manual, nor a Clymer book (admittedly, covering the 2QM20, but not the 15, exactly) give instructions, and I don't think the pump (a "Bosch integral type") has any bleed screws.
So, before I take it apart and clean it out, I'd like to make sure I'm not missing a less invasive fix. Any help will be appreciated! |
Paul Brogger
Member
Username: broggerp
Post Number: 4
Registered: 10-2007
| | Posted on Monday, October 08, 2007 - 05:27 pm: |
|
Ooops! Not "Clymer", but "Chilton" ("Seloc"). Regardless -- it doesn't specifically cover the 2QM15, but does the 2QM20, which has a (seemingly) identical injector pump. |
Ronald E Cairns
Member
Username: ron_cairns
Post Number: 44
Registered: 12-2005
| | Posted on Monday, October 08, 2007 - 09:44 pm: |
|
test |
Ronald E Cairns
Member
Username: ron_cairns
Post Number: 45
Registered: 12-2005
| | Posted on Monday, October 08, 2007 - 09:47 pm: |
|
Bleed the system and final bleed will be at the FI pump, you may have to get 2 12 mm packings when you loosen the banjo bolt at the pump. Once done it should self bleed to the injectors. Some install an outboard fuel bulb to PUSH fuel before the filters all the way to the FI pump. Good luck with it it |
Paul Brogger
Member
Username: broggerp
Post Number: 5
Registered: 10-2007
| | Posted on Tuesday, October 09, 2007 - 10:23 am: |
|
Thanks for that. Didn't work, so now I've got the pump (carefully) disassembled for cleaning. (I've crossed the line -- there's no turning back!)
Re: outboard fuel bulb -- see my other post in "General Diesel Questions". It's a great idea to push fuel -- unfortunately, it had a side-effect in stirring up and pushing a bunch of watery, dirty sludge, too. So, the lesson I learned from this: if you take steps to increase the flow of fuel in an old system, clean everything out thoroughly before you start pumping! |
Paul Brogger
Member
Username: broggerp
Post Number: 6
Registered: 10-2007
| | Posted on Friday, October 19, 2007 - 11:59 am: |
|
Well, the injector pump clean-out and reassembly went very well. First time thru, the rack wouldn't move with only gravitational force when the pump was tipped on its side. Turns out one of the pump's piston/collar assemblies was (still?) binding. I cleaned 'em again, dried 'em off, and "lapped" them by moving the piston in & out repeatedly past the point of binding. That freed it up and then the pump behaved correctly when reassembled. Got the engine started again, so the whole fuel system clean-out is finished. (Whew!)
However, the engine is still starting reluctantly, so a compression test is next.
BTW, those few of you who may have the Yanmar service manual for your 2QM15 engine (and maybe others of similar vintage): The illustrations and text for the injector pump disassembly and reassembly instructions are obviously mismatched. Pay little attention to the pictures, follow the text, and you'll do fine.
(And, re my original question: There is no specific bleed screw -- simply loosen the nuts holding the injector supply lines at the pump until fuel starts spurting out without obvious bubbles, then tighten 'em down and move on the injectors.) |
|
|
|
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 |
|
