Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 16-09-2019, 19:09   #1
Registered User
 
BigAl.NZ's Avatar

Join Date: Sep 2008
Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
Posts: 367
Perkins 4108 High Pressure Pump Bleed

Hello,

It feels like Dejavu - I am in the situation where I need to bleed my Perkins 4108 again after the engine was starved of fuel.

I have primed with the lift pump the primary filter and fuel comes out. I think my issue now is with the High Pressure pump and exactly which screws need to be opened to bleed it.

There is a good guide here from TAD : http://www.tadiesels.com/assets/docs...20Changing.pdf

But the pictures are blurry and I suspect I have the later model of high pressure pump.

Mine looks like this.

Which screws should I loosen and in what if any order?
Attached Thumbnails
Click image for larger version

Name:	Perkins4108.jpg
Views:	126
Size:	186.7 KB
ID:	199978  
__________________

BigAl.NZ is offline   Reply With Quote
Old 16-09-2019, 19:26   #2
rbk
Registered User

Join Date: Feb 2016
Location: Whitehorse, YT
Boat: Tayana 37
Posts: 1,274
Re: Perkins 4108 High Pressure Pump Bleed

Canít see which pump you have but looks like cav from a quick look. Low pressure union into the pump, side bleed screw, governor bleed screw and each injector line. Follow the fuel and tighten each as bubbles stop from low pressure to the injectors. Best to have an electric pump or someone else working the lift pump for the first bit then crank the starter once fuel is to the pump.
__________________

rbk is online now   Reply With Quote
Old 16-09-2019, 19:28   #3
rbk
Registered User

Join Date: Feb 2016
Location: Whitehorse, YT
Boat: Tayana 37
Posts: 1,274
Re: Perkins 4108 High Pressure Pump Bleed

Bad internet connection got a chance to see your pic. Donít touch screw 2. Just 1&3 as well as low pressure line in and injectors unions.
rbk is online now   Reply With Quote
Old 16-09-2019, 19:45   #4
Registered User

Join Date: Feb 2010
Posts: 210
Re: Perkins 4108 High Pressure Pump Bleed

Quote:
Originally Posted by BigAl.NZ View Post
Hello,



It feels like Dejavu - I am in the situation where I need to bleed my Perkins 4108 again after the engine was starved of fuel.



I have primed with the lift pump the primary filter and fuel comes out. I think my issue now is with the High Pressure pump and exactly which screws need to be opened to bleed it.



There is a good guide here from TAD : http://www.tadiesels.com/assets/docs...20Changing.pdf



But the pictures are blurry and I suspect I have the later model of high pressure pump.



Mine looks like this.



Which screws should I loosen and in what if any order?


#2 is either the idle screw or max rpm screw so no need to loosen it but #1 and #3 are the governor and case bleed screws. Avoid overtightening the bleed screws, they break easily. In your photo it looks as though the stop control linkage/chain is under a bit of tension, best to make sure the little lever on the pump is happily sitting in the "run" position.
No particular order for bleeding but sometimes it's necessary to spin the engine over with those screws slightly open and let the internal vane pump spit out the air.
skipperpete is offline   Reply With Quote
Old 16-09-2019, 20:05   #5
Registered User
 
BigAl.NZ's Avatar

Join Date: Sep 2008
Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
Posts: 367
Re: Perkins 4108 High Pressure Pump Bleed

Awesome. I will have another go later in the week. I am a little suspects of things upstream towards the tank since it was a problem with the Racors that stopped for in the first place.

I might fully loosen the nut on the first filter and check that.
BigAl.NZ is offline   Reply With Quote
Old 16-09-2019, 23:16   #6
Registered User
 
BigAl.NZ's Avatar

Join Date: Sep 2008
Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
Posts: 367
Re: Perkins 4108 High Pressure Pump Bleed

PPS: After servicing the racors, can they just be filled from the top with a jerry can? Refill to the top again?
BigAl.NZ is offline   Reply With Quote
Old 16-09-2019, 23:18   #7
Registered User
 
BigAl.NZ's Avatar

Join Date: Sep 2008
Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
Posts: 367
Re: Perkins 4108 High Pressure Pump Bleed

Quote:
Originally Posted by rbk View Post
Bad internet connection got a chance to see your pic. Donít touch screw 2. Just 1&3 as well as low pressure line in and injectors unions.
Where are the low pressure line in and injector unions? Are they in the picture?
BigAl.NZ is offline   Reply With Quote
Old 17-09-2019, 02:40   #8
Registered User

Join Date: Feb 2010
Posts: 210
Re: Perkins 4108 High Pressure Pump Bleed

Quote:
Originally Posted by BigAl.NZ View Post
Where are the low pressure line in and injector unions? Are they in the picture?


That's a good photo, you managed to capture all the relevant bits. The supply into the pump is the vertical pipe with blue paint on the far rhs that does a u turn. The hp pipes and unions can be seen behind the supply pipe. They are attached to the blackish horizontal extensions that are banjo bolted to the hydraulic rotor head.
skipperpete is offline   Reply With Quote
Old 20-09-2019, 15:48   #9
Registered User
 
BigAl.NZ's Avatar

Join Date: Sep 2008
Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
Posts: 367
Re: Perkins 4108 High Pressure Pump Bleed

Thanks all. Got motor to go but had to use some Enthanol starter fluid - ran great after that but would not start even after leaving the pre heater on for a few minutes.

Incidentially fuel gushed out screw #3. Hardly came out #1.
BigAl.NZ is offline   Reply With Quote
Old 20-09-2019, 15:54   #10
rbk
Registered User

Join Date: Feb 2016
Location: Whitehorse, YT
Boat: Tayana 37
Posts: 1,274
Re: Perkins 4108 High Pressure Pump Bleed

Usually doesn't come out the governor vent very much, sorry I missed your other post. follow the copper line from the top of the on engine fuel filter to the HP pump, it enters above the HP injector lines. When replacing the on engine filter you can end up pushing air into the HP pump for a bit so cracking that line and getting fuel to the HP pump is a first step, then deal with the HP pump bleed ports.
rbk is online now   Reply With Quote
Old 20-09-2019, 15:56   #11
rbk
Registered User

Join Date: Feb 2016
Location: Whitehorse, YT
Boat: Tayana 37
Posts: 1,274
Re: Perkins 4108 High Pressure Pump Bleed

Also try using wd40 rather than ether IF you need some help starting, but you really shouldn't need anything. You will ruin your engine with ether.
rbk is online now   Reply With Quote
Old 20-09-2019, 15:58   #12
rbk
Registered User

Join Date: Feb 2016
Location: Whitehorse, YT
Boat: Tayana 37
Posts: 1,274
Re: Perkins 4108 High Pressure Pump Bleed

Your low pressure inlet is the furthest copper line on the right in your picture.
rbk is online now   Reply With Quote
Old 20-09-2019, 15:59   #13
Registered User
 
BigAl.NZ's Avatar

Join Date: Sep 2008
Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
Posts: 367
Re: Perkins 4108 High Pressure Pump Bleed

Quote:
Originally Posted by rbk View Post
Also try using wd40 rather than ether IF you need some help starting, but you really shouldn't need anything. You will ruin your engine with ether.
Awsome - more great learning.
BigAl.NZ is offline   Reply With Quote
Old 20-09-2019, 16:01   #14
Registered User
 
BigAl.NZ's Avatar

Join Date: Sep 2008
Location: Auckland, NZ
Boat: Hood 38 - Wauquiez
Posts: 367
Re: Perkins 4108 High Pressure Pump Bleed

With the green arrow?
Attached Thumbnails
Click image for larger version

Name:	Perkins4108 (1).jpg
Views:	16
Size:	187.1 KB
ID:	200250  
BigAl.NZ is offline   Reply With Quote
Old 20-09-2019, 18:25   #15
Registered User

Join Date: Feb 2010
Posts: 210
Re: Perkins 4108 High Pressure Pump Bleed

Try and avoid the ether based starting aerosols, they can do harm unless it's done in subzero temperatureClick image for larger version

Name:	IMG_2227.jpg
Views:	27
Size:	251.8 KB
ID:	200260
__________________

skipperpete is offline   Reply With Quote
Reply

Tags
perkins, pump

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Espar Hydronic 4 coolant leak/pressure/bleed question brianc Plumbing Systems and Fixtures 0 07-01-2017 19:05
Oil Pressure Drop On Perkins 4108 S Y Tuppenny Engines and Propulsion Systems 12 23-03-2016 22:08
Perkins 4108 Oil Pressure Russ Pichlik Engines and Propulsion Systems 6 20-07-2015 12:52
Perkins 4108 oil pressure drop Liber Engines and Propulsion Systems 7 09-06-2014 21:42
Perkins 4108 Tachometer Reading High jlogan Engines and Propulsion Systems 2 23-05-2011 16:13

Advertise Here


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:35.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×

ShowCase vBulletin Plugins by Drive Thru Online, Inc.