View Full Version : 300 xs bolt torque specs
V-bottom
08-09-2017, 07:26 PM
Can I get the bolt torque and bolt tightening sequence for 300 xs heads and the front air plenum bolts.
Is there a mercury diagram of the oil pump hoses to the correct brass fittings on the reed plate.
would be much appreciated!
bsumner
08-12-2017, 08:51 PM
NOTE: This list is provided as a QUICK REFERENCE. A Factory Service Manual is your BEST guide for proper torque specifications.
Air Compressor Mounting Bolts: 20 lbs/ft
Air Compressor Head Bolts: 20 lbs/ft
Air Compressor Pulley Screws (BLACK/STEEL Pulley): 170 lbs/in (INCH!!)
Air Compressor Pulley Screws (BLUE aluminum/billet Pulley): 190 lbs/in (INCH!)
Air Handler (Intake Plenum) Mounting Screws: 120 lbs/in
Alternator (V-Belt Driven for EFI) Mounting or Adjuster Screws: 40 lbs/ft
Cylinder Head Bolts- MOST 3L Models: 20 lbs/ft + 90 degrees (Replace bolts if removed)
Engine Mounting Bolts to JACKPLATE: 90 lbs/ft
Engine or Jackplate to FIBERGLASS HULL: 55 lbs/ft
Fuel Rail Mounting Nuts: 35 lbs/ft
Gearcase Mounting Nuts/Rear Bolt (3 Liter Models): 55 lbs/ft
Idler Arm Spring Torque (Opti/Later EFI): APPROXIMATELY 75 lbs/in
Idler Arm NUT: Torque to 35 lbs/ft (recommend red loctite on nut and/or stud).
Powerhead Mounting Nuts: Varies (will post cheat pictures below, at later date)
Propeller Nut Torque- 835257K6 or 835257Q6 Flo-Torq with Conical Sleeve: 100 lbs/ft
Prop Nut Torq: ALL other Hub Kits (including Racing/Fat Shaft): 55 lbs/ft
Reed Box Mounting Bolts: 90 lbs/in (That's INCH POUNDS)
Reed Petal Screws: Screw WITHOUT lockwasher: 12 lbs/in (INCH POUNDS) Use RED loctite
Reed Petal Screws: Screw WITH lockwasher: 8 lbs/in (INCH POUNDS). Use blue loctite
Steering Cylinder (Mercury, Teleflex and U-flex): Tiller Bolt: 20 lbs/ft
Steering Cylinder (Mercury, Teleflex and U-flex): Larger thru-tube Nuts: 50 lbs/ft
Steering Cylinder (Mercury, Teleflex and U-flex): Smaller Ram-End Nuts: 35 lbs/ft
Spark Plugs: 20 lbs/ft
Thermostat Covers: 100 lbs/in (INCH Pounds!)
Tilt Tube (through transom brackets/swivel bracket): 45 lbs/ft (note- errors in manuals)
Water Pump Retaining Screws: 60 lbs/in (INCH Pounds!)
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