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17-06-2018, 00:19
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#1
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,532
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Re-Fitting Injectors - Best Practice?
What is the best practice when it comes to refitting an injector into the head?
Especially in terms of preventing it from becoming stuck next time it is removed.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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17-06-2018, 07:58
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#2
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Registered User
Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
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Re: Re-Fitting Injectors - Best Practice?
Aviation spark plug lube.
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17-06-2018, 11:05
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#3
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Re-Fitting Injectors - Best Practice?
Quote:
Originally Posted by Ecos
Aviation spark plug lube.
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Which is either lead or graphite?
Used the lead based on Military turbine engines and the graphite on Civilian recip engines.
Never thought to use antiseize on injectors.
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17-06-2018, 11:24
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#4
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Registered User
Join Date: Nov 2016
Location: The Pacific
Boat: 44ft mono hull
Posts: 391
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Re: Re-Fitting Injectors - Best Practice?
Tef-gel. It's awesome.
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17-06-2018, 12:01
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#5
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re-Fitting Injectors - Best Practice?
Quote:
Originally Posted by Olly75
Tef-gel. It's awesome.
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Yes, but is it made for high temps?
Then of course there is the what does the engine manufacturers manual say?
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17-06-2018, 13:40
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#6
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: ‘01 Catana 401
Posts: 9,626
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Re: Re-Fitting Injectors - Best Practice?
I’ve always used copper or graphite based anti seize.
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17-06-2018, 15:33
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#7
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,532
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Re: Re-Fitting Injectors - Best Practice?
Quote:
Originally Posted by a64pilot
Yes, but is it made for high temps?
Then of course there is the what does the engine manufacturers manual say?
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In this instance the manual gives no guidance. I would be interested to hear what other manuals say about the issue.
Also some real life experiences of what works or doesn't.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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17-06-2018, 16:15
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#8
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Registered User
Join Date: Nov 2016
Location: The Pacific
Boat: 44ft mono hull
Posts: 391
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Re: Re-Fitting Injectors - Best Practice?
Tef gel is good to 350 degrees c if I recall correctly. my manual also gives no guidance.
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17-06-2018, 17:29
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#9
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Registered User
Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
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Re: Re-Fitting Injectors - Best Practice?
In the case of a Perkins, nothing is needed. The copper gasket is the only seal. There are no threads to seal but, the space between the nose/body and the head can jamb up with gunk so some sort of sealant/compound is great for future removal. Not worth mentioning in the manual, perfume on a pig.
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17-06-2018, 17:49
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#10
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,532
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Re: Re-Fitting Injectors - Best Practice?
This is the kind of stuck I wish to avoid http://www.cruisersforum.com/forums/...-202441-2.html
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Sure there are always methods of removing a stuck injector but IMO, preventative is better than cure - hence this thread.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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17-06-2018, 19:17
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#11
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Re-Fitting Injectors - Best Practice?
Maybe I should jinx myself, but as have never had a stuck injector. I assume those that are, have not been removed in decades?
I have mine out every couple of years. I didn’t on my truck as that was an entire weekend to replace injectors. Things were about eight inches long too.
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17-06-2018, 20:10
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#12
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,532
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Re: Re-Fitting Injectors - Best Practice?
Quote:
Originally Posted by Olly75
Tef gel is good to 350 degrees c if I recall correctly. my manual also gives no guidance.
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I had a look at the copper Never Seize can, says it good for 980C or 1800F! Maybe I should try it; on the sides, not the seat / nozzle.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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17-06-2018, 20:12
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#13
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,532
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Re: Re-Fitting Injectors - Best Practice?
Quote:
Originally Posted by a64pilot
Maybe I should jinx myself, but as have never had a stuck injector. I assume those that are, have not been removed in decades?
I have mine out every couple of years. ..........
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Maybe this is really the best practice!!!!!
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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17-06-2018, 22:13
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#14
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Registered User
Join Date: Oct 2015
Posts: 2,007
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Re: Re-Fitting Injectors - Best Practice?
Quote:
Originally Posted by Olly75
Tef-gel. It's awesome.
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It is awesome... and I use it all the time. But it is unsuited for the temperatures at a diesel injector might see.
Use Tef-gel in lots of places on your boat, but when it come time for nuts and bolts on the engine, use a proper metal copper or nickel based anti-sieze rated for high temperatures. They work, and they are made for THAT job.
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18-06-2018, 09:29
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#15
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Registered User
Join Date: Sep 2013
Location: San Francisco Bay
Boat: Chung Hwa Boat Builders, Magellan 36
Posts: 446
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Re: Re-Fitting Injectors - Best Practice?
What about molybdenum disulphide? A anti-sieze around for decades
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