Perkins Injectors.

[gardener180]

Hi,
Goodmorning,
I am hoping to pull the injectors on an old Perkins 4.108 Marine engine.
I am hoping that the injectors come out ok with a pinch bar, but would like to make up a sliding hammer just incase they prove to be tight, as it looks like they have not been removed for a while.
It looks like the spill pipe connection on top of the injector is the place to put a sliding hammer/injector puller.
Does anyone have any idea what thread it is on the top of the injector?, so I can make up a sliding hammer before I start.
Im guessing 1/8 BSP...
It has a CAV DPA rotary fuel pump, so Im guessing it will also be CAV injectors.
Thanks in advance for any replies.
Cheers.

[ianoz]

Had a 4-108 in a Mustang skid steer , Good old Motor ,So Good ,never had the injectors out of in . Muz or stock may have an idea .

[gardener180]

hi ianoz,
thanks for the reply.
I just need to know what the thread is, so i can make up a puller.
I have had a quick look at the job, but cant get back to it till next week, so i just wanted to find out what thread it is so I can make up a sliding hammer this week.
thanks again for the reply,s
cheers,
andy,
scotland.

[Wazza]

Hello Andy and welcome to the forum ,I have no info except a link to a marine site ....http://www.cruisersforum.com/forums/f54/perkins-4-108-injector-removal-67549.html

http://www.cruisersforum.com/forums/...uals-8758.html

[gardener180]

hi wazza,
thanks for the info,
the ones on this engine look fairly rusted in, ill soack them in wd 40 prior to extraction.
im wondering if the small 1/8 bsp thread (i think) on the top of these injectors might just pull out and strip if i made up a sliding hammer ???
thanks again for the info,
regards,
andy.

[Dan]

im wondering if the small 1/8 bsp thread (i think) on the top of these injectors might just pull out and strip if i made up a sliding hammer ???

More than likely, if they are anyway stuck thats not a chance I'd like to take anyway... can you get any pics so we can have a look, any faces on the body that you can get a turn on them with a spanner, whilst pulling from the top ?

[Muz]

Had a quick google (you know the internet thing Dan ) You know I only teasin ....... and it looks like they have a flange base, bit tricky to get to because of the exhaust cooler, but cant you gently lever them from one side and IMO those ones just need a wee crack off, give them a few taps as you go, then hopefully they'll come free, looks as though you'll have to work your way from one side because of the cooler though

[gardener180]

hi,
thanks for the reply,s
yeah there are flats on the body, for taking off the cap to adjust the opening pressure etc, and i should be able to get in with a couple of smaller pinch bars.
The more im thinking on it, i recon the sliding hammer thing will just not be an option on these injectors, as it will just pull the thread out if they are at all tight.
sorry i cant get any pics, i only had a quick look at it and i wont see it again till next week when i go to pull them out..... i just like to be prepared, im a pesamist, so i always like to try and prepare for the worst case situation, lol

[ianoz]

Going by Wazza's link plenty of loose juice applied the day before seemed to be the way to go .