Author Topic: Front oil plug is leaking, lucky me :(!  (Read 765 times)

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Offline bluezboy

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Front oil plug is leaking, lucky me :(!
« on: December 15, 2019, 07:40:44 AM »
Well after an engine rebuild on my 73’ 750 last May, my engine has sprung a leak right out the oil passage hole. I’ve heard here that the chance of that ever happening was slim, but I have the oil puddles to prove it. I have a new o ring for that sucker, now to that plug out. Any tips would be most welcome, thanks

Offline MauiK3

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Re: Front oil plug is leaking, lucky me :(!
« Reply #1 on: December 15, 2019, 08:09:53 AM »
Try a gentle tap with your impact driver and a hammer, it should shake loose.
If you don't have an impact driver, use a flat bladed screwdriver and hit the head while turning.
Be careful, don't strip the head out.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline kerryb

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Re: Front oil plug is leaking, lucky me :(!
« Reply #2 on: December 15, 2019, 08:12:42 AM »
Would that be the "oil passage hole" that serves the oil tank with an o-ring fitting and two screws under the right rear area of the engine?  Or would it be the "oil passage hole" just below and to the rear of the ignition cover?  Those are the only three that I can think of that use an o-ring, in which case you might be able to change the o ring without losing too much oil by laying the bike on its side to do the work (drain the carbs first).  Or, you could make a fun game out of it...test your ninja mechanic skills by seeing if you can change the o-ring before all the oil runs out.  Maybe even one-handed with the other thumb blocking the open oil passage while you do the work.
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Offline bluezboy

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Re: Front oil plug is leaking, lucky me :(!
« Reply #3 on: December 15, 2019, 08:25:38 AM »
Would that be the "oil passage hole" that serves the oil tank with an o-ring fitting and two screws under the right rear area of the engine?  Or would it be the "oil passage hole" just below and to the rear of the ignition cover?  Those are the only three that I can think of that use an o-ring, in which case you might be able to change the o ring without losing too much oil by laying the bike on its side to do the work (drain the carbs first).  Or, you could make a fun game out of it...test your ninja mechanic skills by seeing if you can change the o-ring before all the oil runs out.  Maybe even one-handed with the other thumb blocking the open oil passage while you do the work.
.  Naaaah, it’s the one right above the oil filter housing. Thanks for the suggestions fellas

Offline PeWe

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Re: Front oil plug is leaking, lucky me :(!
« Reply #4 on: December 15, 2019, 09:32:16 AM »
How can that plug start to leak? It must have been removed before, right?
You need something that fit perfectly in its slit like a coin you can twist with a rigid wrench.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline madmtnmotors

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Re: Front oil plug is leaking, lucky me :(!
« Reply #5 on: December 15, 2019, 11:25:06 AM »
I have replaced a few without drama. Have you tried to remove it yet?
TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
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"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
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Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
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Offline bluezboy

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Re: Front oil plug is leaking, lucky me :(!
« Reply #6 on: December 15, 2019, 05:49:20 PM »
How can that plug start to leak? It must have been removed before, right?
You need something that fit perfectly in its slit like a coin you can twist with a rigid wrench.
.  I’m as baffled as you are about why it began to leak, I’ve never touched it. Thanks for the coin suggestion, another member just suggested that trick, I’ll give a try tomorrow

Offline Spanner 1

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Re: Front oil plug is leaking, lucky me :(!
« Reply #7 on: December 15, 2019, 05:56:31 PM »
Hi Vern !... Merry Christmas to you and family.
If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline bluezboy

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Re: Front oil plug is leaking, lucky me :(!
« Reply #8 on: December 16, 2019, 04:32:51 AM »
Hi Vern !... Merry Christmas to you and family.
Hey Spanner, Merry Christmas to you and your family!