Author Topic: '78 CB750F - Orange-ish Black  (Read 11606 times)

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Offline Davidov

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Re: '78 CB750F - Orange Terror - Never giving up
« Reply #50 on: April 08, 2015, 06:45:35 AM »
It only made sense to replace the front wheel bearings as well.
Did it with a All Balls kit for the front. Awesome price, great product.
I found the original single-sided seal bearings, so the modern bearings are a welcomed upgrade.


Update on oil leaks, I unbolted the valve cover with the engine mounted in the frame to replace the gasket. Let's say, it's not easy, but it can be done.
When I reassembled the engine I used 3-Bond on the upper side of the gasket. I did have it installed correctly, judging by the asymetrical cutout for the cam chain/sprocket. Most of the gasket came off no problem (thank to the 3-bond), but some of it stuck to the valve cover, so cleaning it was a bear.

I used a DK brand gasket from 4into1, with Permatex non-hardening "form a gasket 2" brown stuff on the cyl head side of the gasket.

I noticed some of the valve cover bolts (I changed them to allen/socket head black oxide bolts) were easier to break loose than some of the others. Maybe the bolt material strectched a little after a few warm up cycles? But that shouldn't matter, they are 10.9 grade bolts. (Yes, of course I torqued them the first time)

The only visible problem was pictured below. The right side, where the leak was, looks like the bolt holes became oblong. Either the Hondabond became too tacky during install, and caused the gasket to stick and slide. Or the heat cycles made the gasket slide since the cyl head gets hotter than the valve cover, and the top side was glued to the cover.  :o
« Last Edit: March 23, 2016, 12:20:29 PM by Davidov »
-David

Offline calj737

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Re: '78 CB750F - Orange Terror - Always something to replace
« Reply #51 on: April 08, 2015, 12:36:03 PM »
Did you use any thread sealant on the cover bolts? Some AntiSieze or LocTite blue? Just a small dab of blue if you do use it, but proper amount of A/S is a good practice.
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Offline Davidov

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Re: '78 CB750F - Orange Terror - Always something to replace
« Reply #52 on: March 23, 2016, 12:20:00 PM »
http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Preparing for engine teardown again. Thanks to shat parts (see topic above)
 Top-End only, so it won't as involved at the complete rebuild I did in 2014. Just gaskets and the Honda original cam chain components.

It's also time to modify the frame to use Frank's (754) kit. Since it's just the top end coming apart (Valve cover, Cylinder Head, Cylinders)
There is no need to pull the complete engine. Less work, less time.

Now to see if it will be running by Dallas Mods vs. Rockers #10 :o
-David

Offline s10hornet

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Re: '78 CB750F - Orange Terror - Always something to replace
« Reply #53 on: March 24, 2016, 05:56:22 AM »
here's another f model in orange and silver.
friend of mine did this build and the paint.

Offline Davidov

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Re: '78 CB750F - Orange Terror - Always something to replace
« Reply #54 on: April 08, 2016, 12:31:04 PM »
Frame modified, and adapters installed.

Cam/Valve cover removed for teardown.
-David

Offline Davidov

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Re: '78 CB750F - Orange Terror - Keeping it on the road
« Reply #55 on: April 09, 2016, 04:33:53 PM »
My 750F thread is part documentation of the motorcycle in general for myself, and also part archive for anyone searching the forums in the future for information.

Camshaft and cam towers removed. You can spot the cap nuts/acorn nuts where the copper washers need to be.

Cylinder block assembled.
« Last Edit: April 10, 2016, 06:18:22 PM by Davidov »
-David

Offline Davidov

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Re: '78 CB750F - Orange -
« Reply #56 on: September 08, 2016, 07:36:09 PM »
New stator. Found a few NOS stators, but this one is aftermarket.
I hope its not junk.

Cleaned all surfaces, new gaskets for the left side covers. Alternator and shifter covers.

It charges great now. Battery, Rick's Regulator/Rectifier combo unit, stator, and all connectors cleaned and treated with dielectric grease.  :o

Adding some reliability is my main concern with this old stallion.
-David