Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-07-2015, 12:37   #1
Registered User
 
storyinframes's Avatar

Join Date: Oct 2010
Location: Mumbai
Boat: Westsail32
Posts: 256
Images: 2
Send a message via Skype™ to storyinframes
Air lock?

I have a Perkins 4108. Today I changed the oil and all the filters. After that I started the engine. It did fire and started but died within 5 seconds.

Is there an air lock in my fuel line?
Can someone advise me how to bleed the line and which line?

What other problem could be there?

Thanks

Prashantt
Green turtle cays


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
storyinframes is offline   Reply With Quote
Old 10-07-2015, 12:54   #2
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,365
Re: Air lock?

I always filled the engine fuel filter housing whenever possible when changing filters. For bleeding I never had to bleed anywhere but at each injector starting with the first in line.
__________________

__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 10-07-2015, 13:11   #3
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,381
Re: Air lock?

When you say "all the filters" I assume that means fuel filters as well as oil filters. If you did change the fuel filter then the symptom you describes is almost certainly air in the fuel lines.

Most boats have two fuel filters. First thing, as Cheechako says, when you change the fuel filter fill the housing with diesel before trying to start the engine.

Depending your engine and the location of the fuel tank this might be enough. Since you tried to start it and it died you probably sucked more air into the lines and may have to bleed the fuel lines. Are you familiar with this process?
__________________
The water is always bluer on the other side of the ocean.
skipmac is online now   Reply With Quote
Old 10-07-2015, 13:16   #4
Registered User
 
sparrowhawk1's Avatar

Join Date: Jan 2014
Location: Miami Beach Fl
Boat: Colombia Cc 11.8
Posts: 1,252
Re: Air lock?

If your exhaust is raw water cooled as most are be careful not to turn the engine over too long without starting, the exaust will fill with water. Shut off the raw water intake, make sure your filters are full of fuel, crack the fuel injectors, turn the engine over for no more than 15 seconds then let rest for a few minutes so you don't overheat your starter.
__________________
sparrowhawk1 is offline   Reply With Quote
Old 10-07-2015, 14:17   #5
Registered User
 
NoTies's Avatar

Join Date: Nov 2005
Location: Vanuatu
Boat: Whiting 29' extended "Nightcap"
Posts: 1,378
Images: 2
Re: Air lock?

Filling the engine mounted fuel filter from a jug instead of using the priming or lift pump can lead to dirt entering the injector pump.
__________________
Pete

Positively, socially deviant.
NoTies is offline   Reply With Quote
Old 10-07-2015, 15:47   #6
Registered User
 
cheoah's Avatar

Join Date: Sep 2010
Location: North Carolina, USA
Boat: Moccasins and pony
Posts: 996
Re: Air lock?

Good point, no ties. Cool to fill the racor (primary) with a jug but anything going into engine mounted secondary needs to be filtered. Baja is fine.


Sent from my iPad using Tapatalk
__________________
cheoah is offline   Reply With Quote
Old 10-07-2015, 17:41   #7
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,365
Re: Air lock?

Whatever you put in the filter should be clean. If you don't know then "yer doin it wrong"! :>)
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 10-07-2015, 18:35   #8
Registered User
 
NoTies's Avatar

Join Date: Nov 2005
Location: Vanuatu
Boat: Whiting 29' extended "Nightcap"
Posts: 1,378
Images: 2
Re: Air lock?

I see plenty of examples of damage to common rail fuel systems here from people following the practice.
__________________
Pete

Positively, socially deviant.
NoTies is offline   Reply With Quote
Old 10-07-2015, 19:53   #9
Registered User

Join Date: Nov 2014
Posts: 607
Re: Air lock?

Here is the 4-108 bleed drill:
1. Fill the Racor or equiv. with fuel.
2. Loosen the following:
- Bleed bolt on the top of the on- engine fine filter, or the return line banjo bolt if no bleed bolt.
- governor bleed bolt on the injection pump body ( directly below the throttle actuator arm/ cable attachment)
- fuel return line attachment nut between the high pressure lines at the aft end ( high pressure end) of the injection pump.

3. Using the hand primer pump ( lift pump) lever, pump fuel until air free fuel comes out of the bleed bolt on the fine filter, then close the bleed bolt or tighten the banjo bolt. If no fuel comes out, rotate the crankshaft one turn to get the lift pump off its drive cam lobe.
4. Move to the injection pump and continue pumping with the lift pump until air free fuel comes out of the bleed fitting on the inj. Pump body. Tighten the bleed fitting.
5. Continue pumping with the lift pump until air free fuel comes out of the return line attachment at the high pressure end of the inj. Pump, then tighten up that nut as well.
6. Give the lift pump another 2 dozen strokes just for good measure.
7. Loosen the high pressure injection lines at the injectors, put the throttle lever to full throttle, make sure the stop cable is not pulled, and crank the engine over with the starter motor. Do this for 8 or 10 seconds at a time until fuel spurts from the high pressure lines at the injectors. Stop cranking and tighten the high pressure line nuts at the injectors. The engine is now ready to start. Leaving the throttle setting at full throttle, crank the engine and it should start. If not, repeat all of the above!

If it still won't start, and you flatten your batteries, you can follow the advice in the Perkins Operator manual and " look to your flare locker".

DougR
__________________
DougR is offline   Reply With Quote
Old 12-07-2015, 03:39   #10
Registered User

Join Date: Jan 2008
Location: on boat Malaysia at moment
Boat: dean 11.8 metre
Posts: 16
Send a message via Skype™ to berniekatchor
Re: Air lock?

perkins engines one and only one way to bleed. Squirt wd40 into air intake and start engine on it keep squirting with throttle full open to run engine on propane in wd40 until engine screams
rush to slow it down never fails often perkins engines are stubborn to bleed and this method is used by many professionals
__________________
berniekatchor is offline   Reply With Quote
Old 12-07-2015, 03:56   #11
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Air lock?

Quote:
Originally Posted by berniekatchor View Post
perkins engines one and only one way to bleed. Squirt wd40 into air intake and start engine on it keep squirting with throttle full open to run engine on propane in wd40 until engine screams
rush to slow it down never fails often perkins engines are stubborn to bleed and this method is used by many professionals

I think I remember reading that this could crack the rings? Or was that some other kind of aerosol? The reasoning was that the aerosol explodes rather than burns. I thought at the time it was sound logic from someone who knew their stuff but I can't find the thread now to confirm.

Matt


Sent from my iPad using Cruisers Sailing Forum
__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is online now   Reply With Quote
Old 12-07-2015, 04:32   #12
Registered User

Join Date: Jan 2008
Location: on boat Malaysia at moment
Boat: dean 11.8 metre
Posts: 16
Send a message via Skype™ to berniekatchor
Re: Air lock?

that was ether based sprays propane is more gentle and many trucks and cars run on it
__________________
berniekatchor is offline   Reply With Quote
Old 12-07-2015, 04:33   #13
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Air lock?

Quote:
Originally Posted by berniekatchor View Post
that was ether based sprays propane is more gentle and many trucks and cars run on it
Ah, good to know, thank you.

Matt
__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is online now   Reply With Quote
Old 02-08-2015, 19:52   #14
Registered User
 
storyinframes's Avatar

Join Date: Oct 2010
Location: Mumbai
Boat: Westsail32
Posts: 256
Images: 2
Send a message via Skype™ to storyinframes
Re: Air lock?

Everyone thank you very much for the reply!
and I am sorry for the absence here.
I will explain you what was the problem apart from the air lock.
after bleeding the fuel lines, the problem still persisted.
I remembered a Cuban Engineer in Rybovich categorically warning me NOT to put a gasket in the secondary fuel filter. I had simply forgotten about it after a month and i did put the round gasket on the circumference of the filter. This blocked the fuel supply from the sides.
When I removed the gasket, bled the lines again, the engine started. :-)
__________________
storyinframes is offline   Reply With Quote
Old 03-08-2015, 04:20   #15
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Air lock?

Well great to have it sorted and good luck to make the mistake when safely at dock, not in the middle of an ocean somewhere.


Sent from my iPad using Cruisers Sailing Forum
__________________

__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is online now   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Steering wheel turns lock to lock GILow Construction, Maintenance & Refit 32 24-02-2013 01:19
Lock & Lock vs Lock-it - Thoughts ? avb3 Provisioning: Food & Drink 7 14-07-2011 02:30



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:34.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.