Johnson   Johnson Outboard Parts
Johnson Forum Johnson Outboard Parts Discussion Forum Johnson Outboard Parts Boat Parts Johnson Forum Outboard Motor Parts Contact Us
Johnson Parts
  #1 (permalink)  
Old 10-10-2017, 11:01 AM
Junior Member
Join Date: Oct 2017
Posts: 1
Default Backfiring help needed. Thx in advance

Hello everyone, new to the forum. I have a 1979 Johnson 175 (model 175TL79R) It was backfiring thru the prop. I pulled the flywheel and the key was sheared. I installed a new key, torqued to 105psi, checked tdc, all lined up. Sprayed a little starter fluid and it's still backfiring thru the exhaust. The wires and coils are next to the plugs so can't mess that up. Am I missing something
Reply With Quote
  #2 (permalink)  
Old 10-10-2017, 12:28 PM
Senior Member
Join Date: May 2016
Posts: 466

The torque is wrong!

The flywheel nut torque on a V6 is 145 foot pounds.... and the key must absolutely be the proper 307480, not some key from a hardware store. Also, the key must be installed so that the straight edge is vertical with the engine... NOT... aligned with the crankshaft taper.

Make sure the flywheel and crankshaft tapers are clean and free of defects from being spun!
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 09:40 AM.

Outboard Parts

Other Forums
Yamaha Parts
Mercury Parts
Suzuki Parts
Evinrude Parts
Honda Parts

Copyright 2000 - 2017, Outdoor Network LLC