Author Topic: 78 CB 550K motor rebuild (Read 62718 times)

flatlander · « **Reply #25 on:** August 12, 2016, 06:43:51 AM »

cool, i'll follow along... sounds like you're doing pretty much the same setup as i did.

AlekStooge · « **Reply #26 on:** August 12, 2016, 08:55:43 PM »

Quote from: calj737 on August 12, 2016, 06:36:22 AM

"fasle neutral" is more accurately when you shift to a gear, but find "neutral engagement" between gears, making you feel as though you've hit neutral, not 3rd, 4th or 5th. But "grinding" when shifting down to neutral surely needs investigation.

I don't see much wear on my transmission components, so I wouldn't know what to look for. I think I just over shifted into first and got that noise. I've had it happen on my other bike so it's probably just me.

Anyways I don't think I'll have to do anything with the connecting rods but I'd like to get that confirmed?

Quote from: flatlander on August 12, 2016, 06:43:51 AM

cool, i'll follow along... sounds like you're doing pretty much the same setup as i did.

Welcome

AlekStooge · « **Reply #27 on:** August 24, 2016, 06:38:00 PM »

Here is a picture of one of the dogs. I'd say these look pretty good and don't need to be replaced.

I received most of my seals, puck and O-rings except a few on back order from DavidSilver along with the cam chain and primary chain.

Do I plastigauge with new seals in or use the old ones? What about the connecting rods?

lightsareout · « **Reply #28 on:** August 25, 2016, 05:01:41 AM »

Following along; I plan to do a simlar build with one of the 550 motors I have

Darren Jakal · « **Reply #29 on:** August 25, 2016, 05:30:17 PM »

Just picked up a 78 550 so I'll be watching this.

Thanks, Darren

AlekStooge · « **Reply #30 on:** August 30, 2016, 09:03:18 PM »

I got all my seals and O-rings as well as the primary chain and cam chain. I'm going to plastigauge my crank bearings tomorrow. Does installing the gasket between the cases making a difference? Also the seals?

If the clearance checks out good, which I'm confident it will. Then I'll start working on closing the cases back up. For the gasket surfaces I will use Hondabond, but where should I use oil vs. assembly lube? What about wheel bearing grease for O-rings?

Can anyone comment on the dogs?

AlekStooge · « **Reply #31 on:** August 31, 2016, 08:51:14 AM »

For some reason I thought there was a gasket between the cases.

AlekStooge · « **Reply #32 on:** August 31, 2016, 10:31:29 AM »

Unless you are referring to the base cylinder gasket then I don't see it,

AlekStooge · « **Reply #33 on:** August 31, 2016, 12:49:11 PM »

Is there a torque spec for the crankcases? I going to be using an Allen head set for my engine? I guess I'll have to get more bits and an adapter for my torque wrench if there is.

AlekStooge · « **Reply #34 on:** August 31, 2016, 02:16:58 PM »

I looked in Clymers which one are you referring to?

Yeah I just realized the allen heads are for the covers and not the cases.

DaveBarbier · « **Reply #35 on:** September 01, 2016, 02:13:22 PM »

Just to clarify a bit. When plastigaging don't use any lube on the crank. It goes in dry, as dry and clean as you can get it.

Don't put any sealant on the case halves yet, wait until you're buttoning it up completely.

AlekStooge · « **Reply #36 on:** September 08, 2016, 07:10:50 AM »

Looks like I'll be getting new bearings. I got a reading of .0015 across the board. What's weird is that the plastigage crushed not in the center but on the sides. Is that normal?

Getting new engine hardware as well.

AlekStooge · « **Reply #37 on:** September 08, 2016, 07:35:04 AM »

I'm looking at ordering new bearings. I've been told the code for the letters and colors is stamped on the back of the cases. All I see what look like 5 Bs or couple of them Rs. I don't understand the manual either. CMSNL looks like it is missing one bearing on it's list http://www.cmsnl.com/honda-cb550k-1978-usa_model7222/partslist/E++13.html#results

Please help

DaveBarbier · « **Reply #38 on:** September 08, 2016, 08:16:47 AM »

You don't need new bearings. The manual says if the clearance is GREATER than .003" they should be replaced. A tighter tolerance means the plastigage will squish MORE. If you're truly measuring .0015" then you're well within spec. The plastigage won't squish at all in the middle because the bearing has an oil channel. Kind of hard to see in your picture but if what you're seeing is similar to mine (look at this link from my build thread http://forums.sohc4.net/index.php/topic,140833.msg1601137.html#msg1601137) then you're good to go!

AlekStooge · « **Reply #39 on:** September 08, 2016, 09:17:16 PM »

Dave is right ^

I was mistaking the values of numerals being reversed as if they were negatives. Forgot we haven't made it past zero yet. That with also seeing the largest mark on the plastigage with .001 think thinking it was the greatest.

My mistake

DaveBarbier · « **Reply #40 on:** September 09, 2016, 04:14:14 AM »

And I f'ed around during math class. Just think what I'd know if I listened!

AlekStooge · « **Reply #41 on:** September 25, 2016, 05:01:55 PM »

Should I get my crank balanced? I thought that was something geared more for racing but I had an old timer today tell me to get it done.

DaveBarbier · « **Reply #42 on:** September 25, 2016, 06:16:08 PM »

I didn't do it, I don't think it's that necessary for the expense.

AlekStooge · « **Reply #43 on:** September 29, 2016, 07:57:27 AM »

When I was plastigaging my bearing I noticed the cases didn't sit flush on one side by about 1/8 inch, till I of course torqued them down. Do the surfaces need to be decked flush or is this typical?

AlekStooge · « **Reply #44 on:** September 29, 2016, 08:04:26 AM »

Good one less thing I need to do. Just waiting for a washer I was missing to come in before I reassembly the cases.

DaveBarbier · « **Reply #45 on:** September 29, 2016, 08:06:35 AM »

When you put it all together just make sure the half rings around the tranny bearings are in place properly same with the locating pins in the tranny bearings. The cases should mate together nicely.

AlekStooge · « **Reply #46 on:** September 29, 2016, 08:22:47 AM »

Alright I'll post something before I seal them up.

AlekStooge · « **Reply #47 on:** October 03, 2016, 10:51:06 PM »

Not sure how circlip #18 sits? http://www.cmsnl.com/honda-cb550k-1978-usa_model7222/partslist/E++08.html#results

The blue piece in picture one is #15.

DaveBarbier · « **Reply #48 on:** October 04, 2016, 04:23:01 AM »

That clip holds the clutch on the transmission shaft. You need to install the clutch and then you'll see how that circlip goes.

The tranny shaft is hollow to allow for that spring plate in your second picture to slide on.

DaveBarbier · « **Reply #49 on:** October 04, 2016, 04:24:14 AM »

You soak your friction discs in oil?

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Author Topic: 78 CB 550K motor rebuild (Read 62718 times)