High revving engine - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 08-29-2003
Junior Member
 
Join Date: Jun 2003
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
geewhiz is on a distinguished road
High revving engine

On accelerating slightly yesterday my engine started revving very high I battled to cut the engine , eventually got it right .
any ideas - somebody said it might be oil .
Reply With Quote Share with Facebook
  #2  
Old 08-29-2003
Senior Member
 
Join Date: Jul 2001
Posts: 459
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
DuaneIsing is on a distinguished road
High revving engine

geewhiz,

What kind of engine? diesel, gas, outboard, inboard? What did you do to "eventually get it right?"

We need a lot more info to help you.

Duane
Reply With Quote Share with Facebook
  #3  
Old 08-29-2003
Junior Member
 
Join Date: Jun 2003
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
geewhiz is on a distinguished road
High revving engine

Sorry , the engine is a yanmar 2gm20 - 18hp 2 cylinder diesel . It came right by itself but this is the 2nd time its happend in 6 months .
Reply With Quote Share with Facebook
  #4  
Old 08-29-2003
Junior Member
 
Join Date: Mar 2003
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
albertegan is on a distinguished road
High revving engine

geewiz
If it''s a diesel the only reason diesels start running away from themselves is because their mixture becomes too lean. So you either were running out of fuel-not likely if it cointinued to run. or two you have a leek in the fuel line or system some where wjere your getting air in the line. or three your filtertration system may be starving the engine of fuel. or four you have a injector pump problem. Check for leaks around fittings and gaskets first then replace all filters and check for water in the seperator. Lots of luck. Al
Reply With Quote Share with Facebook
  #5  
Old 08-29-2003
Senior Member
 
Join Date: Jul 2000
Posts: 172
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
joub is on a distinguished road
High revving engine

One possiblity may be the throttle cable clamp. The throttle cable outer sheath is typically clamped to a bracket near the speed control lever. When the throttle handle is advanced, the throttle cable control wire i.e. the center wire extends to advance the speed control. If the clamp is broken or loose, the entire cable(outer sheath and all) could move forward. This could cause the engine speed to be higher than expected. When the throttle handle was retarded, the cable wouldn''t come back to the normal idle position and would seem as though things were out of control. The fact that the problem corrected it''s self my indicate the cable returned to it''s normal positon until the next time it decides to shift.
I would check it out.
Jim
Reply With Quote Share with Facebook
  #6  
Old 09-02-2003
AJS AJS is offline
Member
 
Join Date: Oct 2002
Posts: 44
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
AJS is on a distinguished road
High revving engine

Diesels run away when they start running on an alternate fuel source. I''ve seen this occur when a diesel starts to consume its own motor oil. Cutting the fuel supply is not effective. This can happen if the motor oil is overful or has become overfilled due to a leaking fuel pump diaphagm. Check the oil to see if it is overfull or smells of diesel fuel.
ajs
Reply With Quote Share with Facebook
  #7  
Old 09-02-2003
Senior Member
 
Join Date: Dec 2002
Posts: 552
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
GordMay is on a distinguished road
High revving engine

AJS:
Other discussions (I''ve seen) of runaway diesels seem to suggest cutting off the air somehow (always problematic).
Why not just lift the de-compression lever?
Thanks in advance,
Gord
Reply With Quote Share with Facebook
  #8  
Old 09-02-2003
AJS AJS is offline
Member
 
Join Date: Oct 2002
Posts: 44
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
AJS is on a distinguished road
High revving engine

Yep, thats a good way to stop a runaway diesel engine. Not recommended for non-emergency use as on some motors it can cause premature wear or breakage to the decompression mechanism.
A CO2 fire extinguisher discharged into the air intake is another way.
AJS
Reply With Quote Share with Facebook
  #9  
Old 09-03-2003
Junior Member
 
Join Date: Jun 2003
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
geewhiz is on a distinguished road
High revving engine

overful oil - looks like the cause .
I had recently filled/overfilled my oil.
Thanks to all who provided me with the various causes .
Reply With Quote Share with Facebook
  #10  
Old 09-03-2003
Senior Member
 
Join Date: Dec 2000
Posts: 654
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
hamiam is on a distinguished road
High revving engine

I had the same problem on the same engine. I overfilled the oil and the only way to shut the engine down was to cover the air inlet. Gave me quite a scare.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Atomic 4 is 4 lovers agent4change Gear & Maintenance 11 08-07-2011 05:14 PM
engine facing aft with saildrive installation levenezia Gear & Maintenance 3 01-16-2005 10:35 AM
Engine Exhaust/Yanmar Problem plong Gear & Maintenance 5 08-30-2001 10:46 PM
Cat30 Exhaust riser blew up - Engine won''t start E_N_Z_O Gear & Maintenance 2 07-31-2001 06:55 PM
Raw Water in Engine wmwtlw Gear & Maintenance 3 02-25-2001 11:31 AM


All times are GMT -4. The time now is 05:50 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.