Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > Fuel System

Reply
 
Thread Tools Display Modes
  #1   IP: 71.36.101.169
Old 07-18-2022, 10:34 PM
chiron's Avatar
chiron chiron is offline
Senior Member
 
Join Date: Feb 2011
Location: Portland Oregon
Posts: 112
Thanks: 0
Thanked 2 Times in 2 Posts
Engine dies only in gear and when it gets up to temp

I haven't been on here in years as life has kept me from the boat, which I'm getting ready to sell. Took it out for one last spin and and had the engine die. This has happened in the past but seems worse.

Engine starts just fine, but once I get under way after 20 min or so it bogs down and dies, unless I put it in neutral where it will keep running. It will start back up immediately unless I put it back in gear. The whole thing seems heat related.

I rebuilt the engine about 100 hours ago.
Tank vent is clear, and above the engine by a couple feet.
Still has the mechanical fuel pump which was also rebuilt.
Carb seems clean.
Filters are fine.
Fresh nonethanol fuel, even added a bit of aviation fuel.
New plugs and coil
has EI ignition with good cap and rotor

I'm stumped

Last edited by chiron; 07-18-2022 at 10:34 PM. Reason: typo
Reply With Quote
  #2   IP: 67.184.216.83
Old 07-18-2022, 11:24 PM
Sam Sam is offline
Afourian MVP
 
Join Date: Apr 2010
Posts: 279
Thanks: 337
Thanked 122 Times in 97 Posts
I'll take a stab at it. Sounds like drive shaft binding after a little while or a fowled prop with a plastic bag, dock line etc. After checking the prop try tying up at a dock, gently run the engine in forward until it dies. Immediately find neutral and see if you can rotate the drive shaft by hand. If this is too difficult to manage sometimes shafts that are "free" slowly rotate in neutral due to oil friction the plates [longer story] or rotate in neutral while sailing. After twenty minutes of motoring the idea is to determine if the drive shaft/prop is causing the problem. The other heat related cause could be a coil that is overheating and or with some friction in the distributor advance weights. I would eliminate these two issues first before moving into considering the carb that has not been regularly used for a long time.
Reply With Quote
The Following User Says Thank You to Sam For This Useful Post:
TimBSmith (07-19-2022)
  #3   IP: 147.161.180.178
Old 07-19-2022, 03:51 AM
Surcouf's Avatar
Surcouf Surcouf is offline
Afourian MVP, Professor Emeritus
 
Join Date: May 2018
Posts: 358
Thanks: 320
Thanked 159 Times in 120 Posts
Stupid question: but when it dies like this, can you spin the shfat by hand while in neutral? If it does not, you know it is 100% shaft related, and can exclude the rest

-- next time your sail, or tied at the dock, run it until it "dies" again, and put your hand on the stuffing box: it is is hot, you may have your culprit. If you had something tied in your prop, you would probably have the issue as soon as you engage the clutch.
-- as already mentioned, an overheating coil could be the issue; I had that in the past, and had to install a "heat shield", between the coil and the exhaust (it was my fault, I had moved the coil 2 inches closer to it...)
__________________
Surcouf
A nostalgic PO - Previously "Almost There" - Catalina 27 (1979)
Reply With Quote
The Following User Says Thank You to Surcouf For This Useful Post:
TimBSmith (07-19-2022)
Reply

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

Forum Jump


All times are GMT -4. The time now is 11:22 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2022, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2022 Moyer Marine Inc.

All Rights Reserved