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Author Topic: How to remove stuck oil jets in heads?  (Read 411 times)

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Offline Ace

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How to remove stuck oil jets in heads?
« on: February 01, 2019, 10:43:20 am »
Hi All,

I've got a busted up late model head and I know the oil jets that feed the cam towers are getting harder to find with a price to match. The head has been out of an engine for 20 plus years and the oil jet is stuck in there, yes it is removable unlike early K0-K1. Anyone know how to get them out without damaging it or the head (I know the head is junk, this may help others).

Done a search as well on the topic - oil jet, stuck oil jet.

Thanks.
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Offline flybox1

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Re: How to remove stuck oil jets in heads?
« Reply #1 on: February 01, 2019, 10:44:01 am »
dont, just spray them thru...
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Online ekpent

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Re: How to remove stuck oil jets in heads?
« Reply #2 on: February 01, 2019, 04:59:54 pm »
 Are you scrapping out the head and just want to salvage the jets ?

Offline macvit7906

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Re: How to remove stuck oil jets in heads?
« Reply #3 on: February 01, 2019, 06:01:03 pm »
do the oil jets look like this?

Offline Ace

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Re: How to remove stuck oil jets in heads?
« Reply #4 on: February 01, 2019, 08:18:39 pm »
Are you scrapping out the head and just want to salvage the jets ?

Scrapping this particular head. I have others that are the same.
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Offline Ace

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Re: How to remove stuck oil jets in heads?
« Reply #5 on: February 01, 2019, 08:19:22 pm »
do the oil jets look like this?

No, they are removable as one has been removed.
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Online 754

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Re: How to remove stuck oil jets in heads?
« Reply #6 on: February 01, 2019, 09:29:00 pm »
 Do you have the o ring out ? After that they like to fall out. Try gently pulling with needle nose pliers.
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Online pjlogue

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Re: How to remove stuck oil jets in heads?
« Reply #7 on: February 02, 2019, 03:30:40 am »
You could try blowing it out with an air hose from the back side.  Make sure to cover it with a shop rag so you catch it and it doesn't get lost.

-P.

Offline Ace

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Re: How to remove stuck oil jets in heads?
« Reply #8 on: February 02, 2019, 07:34:04 pm »
Tried those methods, oil ring out still in there.

I suspect there is some oxidation or some crud that's been there for a long time that is the cause of the issue.

I has been soaked in a hot bath, high pressure blasted and the jet hasn't moved.
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Online ekpent

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Re: How to remove stuck oil jets in heads?
« Reply #9 on: February 03, 2019, 06:03:09 am »
 Don't forget to throw some heat at it as well around the jet area along with some penetrating oil.

Offline Don R

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Re: How to remove stuck oil jets in heads?
« Reply #10 on: February 03, 2019, 09:42:10 am »
 I could carry it to my machine shop, they always seem to fall out along the way when I do that. 50% get lost though.
If the things you own end up owning you, it's better to be owned by some cool things.

Online 754

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Re: How to remove stuck oil jets in heads?
« Reply #11 on: February 03, 2019, 12:06:34 pm »
If you can get a small drill chuck on it,  it will grip pretty good with no damage..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Ace

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Re: How to remove stuck oil jets in heads?
« Reply #12 on: February 04, 2019, 02:09:02 am »
I could carry it to my machine shop, they always seem to fall out along the way when I do that. 50% get lost though.

Haha nice one  ;D
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Offline Ace

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Re: How to remove stuck oil jets in heads?
« Reply #13 on: February 04, 2019, 02:11:17 am »
If you can get a small drill chuck on it,  it will grip pretty good with no damage..

And that's why I post on forums. I never would have thought of that idea.

Either way, when I do get the little bugger out, I'll post how I did it. Thanks for the ideas/assistance guys.
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Offline disco

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Re: How to remove stuck oil jets in heads?
« Reply #14 on: February 04, 2019, 02:45:40 am »
Have you tried pressuring it from below? Grease gun or air? As someone said before, cover with shop rag, unless you enjoy scavenger hunts!
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Offline 2wheels

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Re: How to remove stuck oil jets in heads?
« Reply #15 on: February 04, 2019, 12:24:59 pm »
Can you post a picture of the oil jet?
If it is a pressed in item you could try heating the entire head.  30 minutes in the propane barbaque should be long enough. Full heat.
Then bring the head out and use "quick freeze" or air duster to freeze the oil jet.  The caned air you can buy a walmart to clean your keyboard.  Hold the can upside down and the mist that comes out is close to -40 degrees.
Maybe you can even use the freeze mist to help blow the part out.  But since i don't know what it looks like I am just guessing.
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1978 CB750 F3

Online 754

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Re: How to remove stuck oil jets in heads?
« Reply #16 on: February 04, 2019, 09:40:08 pm »
 Look Up... wayyyyy Up..

The Friendly Giant..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Ace

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Re: How to remove stuck oil jets in heads?
« Reply #17 on: February 08, 2019, 12:00:58 pm »
Here is pic of the oil jet in the head.

I just put some penetrene around the jet, I don't have a drill chuck small enough to fit in and around the jet.

I'll probably resort to heat if I get the spare time over the weekend.
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Offline 2wheels

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Re: How to remove stuck oil jets in heads?
« Reply #18 on: February 08, 2019, 02:06:21 pm »
I wonder if the chuck on a dremmel tool would fit?
1970 CB750 K0 (I can't believe I tossed my duck tail seat in the trash 20 years ago)
1978 CB750 F3

Offline PeWe

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