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gizmoe639
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Joined: Feb 28, 2010
Posts: 3
Location: Apache Junction

PostPosted: Tue Dec 29, 2009 3:12 pm Reply with quote Back to top

Well, I guess I am introducing myself..... Not that anyone cares. I'm hoping to learn something from all you scholars of the roadbike, so don't dissapoint. I own 1980 CB750C. It needs a new back tire, a head gasket, new Oring drivechain, an oil change and a lot of cleaning. I've got the oil change figured out. Now I'm on to the gasket. Anyone know if I have to completely remove the engine to replace the head gasket? It appears there is enough clearance. I am a noob. Should I just bite the bullet and take it to the shop.

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pierre900c
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Joined: Jul 26, 2007
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PostPosted: Tue Dec 29, 2009 3:27 pm Reply with quote Back to top

The engine has to come out to service the head. While you are at it and have the head off, relap the valves and replace the valve stem seals.
With the advice of the folks on the forum and the service manual found on the forum you should be able to tackle it yourself and save $$$.

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genesound
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Joined: Jul 24, 2007
Posts: 44383
Location: Studio City, CA

PostPosted: Tue Dec 29, 2009 3:31 pm Reply with quote Back to top

Welcome to here wave

The motor needs to come out to change the head gasket. But, needing head gasket replacement is a pretty rare condition for these bikes. There is no pressurized oil running through the head/cylinder block joint, so what looks like an oil leak usually is coming from elsewhere and just blowing around to look like a head leak.

All the pressurized oil comes up the pipe behind the cylinder block, from the main oil galley in the case to the head.

Generally it's a valve cover, tach drive, or front tensioner leak causing the issue.

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NMT - New Member Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

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81 CB900C, 83 CB1000C 
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gizmoe639
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Joined: Feb 28, 2010
Posts: 3
Location: Apache Junction

PostPosted: Tue Dec 29, 2009 3:43 pm Reply with quote Back to top

Thanks for the reply! Here is my followup:

After looking again, I see oil all where the gasket is as well as the grommets. Stay with head gasket or is this a sympton of another issue?

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old_dirt
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Joined: Sep 13, 2009
Posts: 1133
Location: West Virginia (Mason County)

PostPosted: Tue Dec 29, 2009 4:01 pm Reply with quote Back to top

Sounds like you are confusing the valve cover gasket with the head gasket.

You don't need to remove the engine to service the valve cover. New gaskets and valve cover bolt gaskets are economically available from many sources and easily changed.

And while you are in there, adjust the valves.

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pd750
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Joined: Aug 01, 2007
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Location: On the road , again .

PostPosted: Tue Dec 29, 2009 9:20 pm Reply with quote Back to top

Welcome to the site DaddyO ... Smile

I'll second what old dirt said . Adjust ALL valves to .005".

Which geological state or province are you living in ?

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mstspot
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Joined: Sep 29, 2009
Posts: 852
Location: Eufaula, Oklahoma

PostPosted: Tue Dec 29, 2009 9:25 pm Reply with quote Back to top

pd likes to visit all the new members is why he's asking

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old_dirt
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Joined: Sep 13, 2009
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PostPosted: Tue Dec 29, 2009 10:37 pm Reply with quote Back to top

My money is on Shelbyville, Ohio.

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vantasticdude
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Joined: Aug 24, 2009
Posts: 437
Location: Reinholds,Pa

PostPosted: Tue Dec 29, 2009 11:30 pm Reply with quote Back to top

Il, IN , KY , MI , Mo , TN , TX

Shocked I'm fealing Indiana Shocked

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Pointdiver
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Joined: Jul 25, 2007
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PostPosted: Tue Dec 29, 2009 11:57 pm Reply with quote Back to top

Good to see you here!
Welcome

From what you have written I agree with my bro's here and say your in for the MUCH easier task of fixing a valve cover gasket leak. Easier then even an oil change once you get the hang of it.

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83 CB1100F (Blue)his
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80 CB750C
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81 750F w/ Wiseco 826 & 900cams


 
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old_dirt
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Joined: Sep 13, 2009
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PostPosted: Wed Dec 30, 2009 12:39 am Reply with quote Back to top

vantasticdude wrote:
Il, IN , KY , MI , Mo , TN , TX

Shocked I'm fealing Indiana Shocked


You really think someone from Indiana would be hip enough to call himself DaddyO?

No way! Gotta be Ohio

Laughing Laughing

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Swampy
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Joined: Nov 26, 2009
Posts: 67
Location: New Orleans La.

PostPosted: Wed Dec 30, 2009 1:32 am Reply with quote Back to top

Shelbyville is the name of the planet that is hidden behind the horsehead nebula..... Everybody knows that.....

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mstspot
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Joined: Sep 29, 2009
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Location: Eufaula, Oklahoma

PostPosted: Wed Dec 30, 2009 8:34 am Reply with quote Back to top

I thought that's where the Simpsons' live?

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gizmoe639
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Joined: Feb 28, 2010
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Location: Apache Junction

PostPosted: Wed Dec 30, 2009 9:04 am Reply with quote Back to top

Everyone knows it's right next to Springfield!!! Ok, so you are close to both IN and OH. Raised in IN, but live in KY now.

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gizmoe639
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Joined: Feb 28, 2010
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PostPosted: Wed Dec 30, 2009 9:10 am Reply with quote Back to top

Old Dirt, that is why we pay you the 1.5 mil. To help the noobie out. I think PD is asking where I live b/c he wants to send me a pretty set of 4 into 4 exhaust pipes and a side cover.

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holysmokes
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Joined: Jul 25, 2007
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Location: ridge road springfield nova scotia

PostPosted: Wed Dec 30, 2009 10:23 am Reply with quote Back to top

i take the mono rail to shelbyville

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genesound
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Joined: Jul 24, 2007
Posts: 44383
Location: Studio City, CA

PostPosted: Wed Dec 30, 2009 10:59 am Reply with quote Back to top

Image

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NMT - New Member Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
81 CB900C, 83 CB1000C 
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old_dirt
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Joined: Sep 13, 2009
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Location: West Virginia (Mason County)

PostPosted: Wed Dec 30, 2009 11:09 am Reply with quote Back to top

Wow, now that's a work of art there!

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pd750
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Joined: Aug 01, 2007
Posts: 24866
Location: On the road , again .

PostPosted: Wed Dec 30, 2009 11:11 am Reply with quote Back to top

DaddyO wrote:
Old Dirt, that is why we pay you the 1.5 mil. To help the noobie out. I think PD is asking where I live b/c he wants to send me a pretty set of 4 into 4 exhaust pipes and a side cover.


I would if I had those precious items to share , but ...

On another note :

Born and raised in MI . Eloped and got married in Cumberland Gap .

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Please put the year and model of your bike in the signature section on your profile / member account page and set \\\\\\\"Always attach signature \\\\\\\" to YES . Just below the Reply box , check the box in front of \\\"Attach signature (signatures can be changed in profile)\\\" . 
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genesound
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Joined: Jul 24, 2007
Posts: 44383
Location: Studio City, CA

PostPosted: Wed Dec 30, 2009 12:15 pm Reply with quote Back to top

old_dirt wrote:
Wow, now that's a work of art there!


Thanks. We've had several new people with confusing ideas of what piece is what in the last while. I hope that will help clarify it.

_________________
NMT - New Member Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
81 CB900C, 83 CB1000C 
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gizmoe639
This Just In
This Just In



Joined: Feb 28, 2010
Posts: 3
Location: Apache Junction

PostPosted: Sun Jan 03, 2010 7:57 pm Reply with quote Back to top

Those pic's were perfect. And it does clarify for me that it is a valve cover gasket issue. Which from what has been discussed is not too difficult to do..

By the way, born in MI, raised in IN, eloped in Big Bend National Park in TX and live in KY.... My vintage honda parts store is opening back up this week so I will be stopping by to get started with the necessary parts. I am sure i will be posting new questions.

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Swampy
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Joined: Nov 26, 2009
Posts: 67
Location: New Orleans La.

PostPosted: Sun Jan 03, 2010 8:57 pm Reply with quote Back to top

Live in Kentucky???? Does anyone really "LIVE" in Kentucky???

Welcome aboard anyway... LOL...

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gizmoe639
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Joined: Feb 28, 2010
Posts: 3
Location: Apache Junction

PostPosted: Sat Jan 23, 2010 9:26 am Reply with quote Back to top

Well, I have finally purchased the valve cover gasket and grommets. I have 2 questions: 1.) Do I need a torque wrench to correctly tighten those screws where I am replacing the grommets? 2.) What tool(s) do I need to adjust the valves to .005" and any advice on how to do this? If you haven't noticed, I am totally green here. Feel free to make fun where you see fit...

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holysmokes
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Joined: Jul 25, 2007
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Location: ridge road springfield nova scotia

PostPosted: Sat Jan 23, 2010 10:16 am Reply with quote Back to top

not screws, bolts

yes , you need a tourque wrench, 9 foot lbs

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On a steel horse i ride


People are just as happy as they make up their
minds to be.” ― Abraham Lincoln
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OldTimer
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Joined: Aug 02, 2007
Posts: 10211
Location: Conroe, TX

PostPosted: Sat Jan 23, 2010 11:07 am Reply with quote Back to top

Papa Smurf says to torque.

Most of use just tighten them till they stop and no more. The rubber on the seal will not allow them to turn out and much tighter as John said will result in stripped aluminum threads.

You will see they have a shoulder on them that prevent them from pulling down too far.

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