127 build up date. - Page 2

Batto · #16 (**permalink**) 06-07-2012, 03:57 PM

G=day all, after taking motor out of bike and pulling top end down the gaskits are fine, the problem lies in the heads.Valve guides on the exhaust port are leaking between head and guide ,so looks like i'm off to have them replaced, The vibration i would reckon was caused buy not shimming up top engine mount, not my fault had a little help there. also do you think if i had of left this leak continue the valve would have sealed or would it have over heated and snaped off and fucked everything

RB Donovan · #17 (**permalink**) 06-07-2012, 05:27 PM

If oil is leaking between the guide and head then you have big problems. That means the guide should drop out with at best a slight tap with a hammer.
If this truly is your problem, they can be repaired. But unless you have plenty of equipment and knowledge this is not something you want to tackle at home.
Guide to head clearance should be -.002--.003.

Also I tried to PM you, but it wouldn't go through.

As far as being computer illiterate I know wher you're at. My skills on this computer are also very limited, but others on this forum have been kind enough to explain how to go from point A to point B.

Batto · #18 (**permalink**) 06-07-2012, 06:08 PM

G-day R.B. yep i was lucky to spot this when i did so now i am going into town and see if i can get a couple of guides to replace the ones that leak i do have a laith and a press to put these back in. i do have another set of heads but there is an oil mark at the exhaust stud,, looks like the same type of thing going on here to. but the valve guide is dry so may have sealed it self. I think i better drop valve out and have a look. thanks mate regards. Rusty. p.s. what do you think is the best methed to install these heat and shrink or press cold.

RB Donovan · #19 (**permalink**) 06-07-2012, 06:38 PM

I've done it both ways.
The problem with the heat is that too much heat and you take the chance of having the seats move.
I don't recommend using a press on the guides. To me it's best that you drive them in with a hammer and driver.
As I mentioned before, if oil got past the O.D. of the giude, you have big problems. I would think (there I go thinking again) the seat and the valve have been pounded.
Don't go buy guides without knowing the diameter of the guide bore, and the O.D. of the guide.
Keep in mind of what the press fit should be, that I had posted earlier.

Just as a side note, I have never seen oil run down between the guide and the head without the head being cracked. Although under certain circumstances I suppose it could.

RB Donovan · #20 (**permalink**) 06-08-2012, 07:46 AM

By the way;
I'm not opposed to heat, it's just that if you do use heat don't go over 250* and chill the guide, then drive the guide in because I don't believe that at that temperature it will expand enough to drop in.

pokergolf420 · #21 (**permalink**) 06-08-2012, 12:08 PM

A good rule of thumb for heating metal is it will grow .001 per inch per 100 degrees F.

Batto · #22 (**permalink**) 06-08-2012, 04:30 PM

thanks fellas i have put another set of heads on the motor and will be letting ultima know of the problem. so will have it running again today,,,,should have been last night but to many BEERS after locking up the motor will try to put up some photos for ya all to see, And that is great advice, from you blokes this is truly a great site as most shops wont give you the time of the day let a lone a bit of knowledge. thanks agian.... regards Rusty.

BadHabit · #23 (**permalink**) 06-09-2012, 06:55 PM

yep...good people here and most of us have given and/or received help at some time or another....

Batto · #24 (**permalink**) 06-12-2012, 05:51 AM

Motor back together,, but front head gasket is leaking thinking i must have not cleaned surface properly leaking at oil passage dowel. only a slite leak may re-torque and see what happens.

RB Donovan · #25 (**permalink**) 06-12-2012, 06:53 AM

Did you replace the head gasket?

Batto · #26 (**permalink**) 06-13-2012, 05:15 AM

i replaced the gaskets top & bottom, it was leaking at oil passage pulled top off today cleaned cyclinder and head surface used copper spray on gasket locked it up and start it tomorrow, Yep i used the old gasket...

Batto · #27 (**permalink**) 06-14-2012, 05:42 AM

Up date started motor, no leaks ,,, running very smooth and flying just shows what a little head work and cooper gaskit spray will do for these motors.. thanks for all the advice you people have given it's very much appreciated. regards Rusty.