Author Topic: How to remove stuck oil jets in heads?  (Read 813 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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Offline 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

Offline 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.
Maker of the WELDLESS 750 Frame Kit
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My next bike will be a ..ANFOB.....

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Lost quite a few CB 750's along the way

Offline 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

Offline 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.

Offline 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!
1976 CB750 K6 Sapphire Blue
1972 CB750 K2 836 Orange Sunrise
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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.
1970 CB750 K0 (I can't believe I tossed my duck tail seat in the trash 20 years ago)
1978 CB750 F3

Offline 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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Offline Ace

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Re: How to remove stuck oil jets in heads?
« Reply #20 on: March 01, 2019, 05:21:59 pm »
Well I couldn't get the jet out of the junk head. Heating with propane torch didn't work. Maybe if I had acetylene torch. So end up cutting around it to get it out.

On another head, I dosed it with penetrene and a week later noticed it has disappeared from around the jet. Got a small pair of pointy nose pliers and managed to pull it out. Took a bit of force but it worked and all good. I couldn't twist it, just pulled straight out. It was covered in gunk so glad I got it out to clean it up.

My take on getting stuck oil jets out would be to use penetrene, if the penetrene is still sitting there ie. hasn't leaked through the jet (blocked jet) and surroundings as it will pool after a week then add head such as the oxygen acetylene torch or equivalent to try and get the oil jet out. There maybe other methods such as mentioned above, be patient and good luck with the little buggers.
1971 CB750 K1
1978 CB750 F2 Supersport - Sold
1981 CB900 Bol d'or - Sold
2006 CBR1100 XX Super Blackbird - Sold

Offline MRieck

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Re: How to remove stuck oil jets in heads?
« Reply #21 on: March 02, 2019, 07:20:09 am »
Davis Silver Spares now sells aftermarket oil jets
Owner of the "Million Dollar CB"

Offline PeWe

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Re: How to remove stuck oil jets in heads?
« Reply #22 on: March 03, 2019, 12:29:16 am »
Yamiya sells the older type, new simplified.  It must take some time to make them.
http://www.yamiya750.com/index.php?main_page=product_info&cPath=246_21_249_51&products_id=3849

I have an old head where this older model must be removed and cleaned up. I prefer easy to take out for next time cam towers are removed to ensure clean oil path.

CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline PeWe

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Re: How to remove stuck oil jets in heads?
« Reply #23 on: March 03, 2019, 06:21:13 am »
I have removed mine. Really easy and a quick job if you know the trick 8)
Hydraulic...
A friend of mine told me how to do yesterday when I was talking about this
He is an old CB750 mechanic since his dragracing days in the 70-80's. Restore other bikes too.

The oil flow thru the 2 oil feed holes that also house 2 cylinder studs.
1. Thread the stud hole on top. I used M10 that can be used direct in existing hole.
2. Plug that stud hole with an M10 bolt
3. Flip head and place it on a container that cover the orifice.
4. Fill stud hole with oil. I used Motul 20w-50. I'm sure any oil will due, even synthetic!  ;D ;D ;D
5. Place a 9mm drill in that hole, bottom first, and whack it down with a heavy plastic hammer.
6. Plop!! The orifice is now in the container
7. Drill was stucked in head for me so flip head and remove bolt, use a thinner pin and tap drill out.
8. Clean orifices and make sure the oil holes inside where the orifices sits are clean.

I'll grind my orifices outside a little with grit 800-1000 to make sure they can be removed easier from top next time.  When cam and towers are removed, perfect reason to clean the oil path with oil filter removed and flush oil passages clean with degreaser. I do no longer trust oil filter that might let particles thru or it can disintegrate it self.
« Last Edit: March 03, 2019, 07:23:47 am by PeWe »
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline 754

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Re: How to remove stuck oil jets in heads?
« Reply #24 on: March 03, 2019, 10:47:13 am »
Geez 89.66 each from Yamiya..
 I could build onesies for way less, most people could..

Your head may have been repairable, if it was, it sure is not now... that you cut the jet out..
« Last Edit: March 03, 2019, 10:51:55 am by 754 »
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

 

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