Author Topic: nuther 76 cb400f SS T-Chain Slipper question  (Read 698 times)

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Offline Redline it

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nuther 76 cb400f SS T-Chain Slipper question
« on: August 24, 2015, 10:10:13 PM »
Objective: Remove Head.
Valve cover is Removed
Cam Chain Tensioner Holder w/Tensioner Damper Removed
Slipper only lifts up an inch or 2 and seems to stop. Wiggling the slipper while rocking the chain back and forth doesn't help.

2 questions:
1: is there a trick to getting it out, or is it even necessary?
2: And is there a mark that the bottom sprocket mates to the chain?
(just checking before any chain slips causes a "split the cases" scenario to put the chain on a mark.)

P.S. So far from what the upper cam shaft bearings and rocker contact surfaces wear is strangely minimal from 30K miles of not taking nothin easy. Honda nailed the lubrication system. 

Offline Redline it

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Re: nuther 76 cb400f SS T-Chain Slipper question
« Reply #1 on: August 25, 2015, 08:33:28 AM »
in the manuals it says to remove the cam chain slipper to remove the head. This one is not removing. It's loose but not coming out. does anyone know why or how it comes out? My luck as in painting, I spend weeks reviewing tips techniques and styles, preferences, then 1 day I start and only when I finish does the first 'search' result show that "wasn't how to do it,"  that's why I'm hoping to find out about the slipper. Thank you!

Offline camelman

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Re: nuther 76 cb400f SS T-Chain Slipper question
« Reply #2 on: August 25, 2015, 09:06:59 AM »
You have to rotate the slipper for it to come free. For the cam chain, there are alignment marks on the timing plate and the camshaft gear that are visible without splitting the case. I really recommend getting a service manual since they come with loads of pictures, diagrams and explanations of how to do this work.
1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline Redline it

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Re: nuther 76 cb400f SS T-Chain Slipper question
« Reply #3 on: August 25, 2015, 06:30:06 PM »
You have to rotate the slipper for it to come free. For the cam chain, there are alignment marks on the timing plate and the camshaft gear that are visible without splitting the case. I really recommend getting a service manual since they come with loads of pictures, diagrams and explanations of how to do this work.

Thanks Camelman, you almost made it in time. took the rear slipper out, (figured it out, the right way, was only hoping to get a message yesterday!!) Cool on the timing chain, I, gonna start unbuttoning the head right now. I was worried about it dropping off the crankshaft, I have the service manual, it doesn't say how to remove the slipper. Sometimes trying to be careful I run into loss time, which I have massive free time to do that.

 Not saying it's the same (and don't read this if you're short on time!)  but I took a 302 out of a 83 mustang, disassembled the entire motor on the garage floor without a manual and with no experience except for L-engines from datsun. I recorded on a single lined sheet of paper the order in which I removed things (because I didn't have a manual, and before computer days,) I had the block bored, the crank was ok, put new pistons and rings, and bearings, a mild RV cam I new chain (and didn't know the difference of cams,) an Edlebrock  intake. Put together on the floor. I only heard that to break a cam in run slightly high rpm for 20 mins, used the old carb. Started and before 4 mins the exhaust just about turned red hot, the flames coming out the carb I knew wasn't right. So I shut it off and had the carb rebuilt by a friend, the power valve was stuck. Any way that 5.0 would almost do a wheelie and get sideways trying coming off the start into second gear!  It was a beast. Couple months later, my wife traded it in for a 500 trade in on a new car. I was like wtf?  And she had a 56 fordamatic truck with a junk motor in it. Sometimes...

Offline camelman

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Re: nuther 76 cb400f SS T-Chain Slipper question
« Reply #4 on: August 26, 2015, 09:25:37 AM »
Sounds like you should get your wife a manual on how to trade in cars.  :)

Good luck with the rebuild. These engines can be a little finicky with all the little bits used to assemble them. This forum is great for support, but you sometimes don't get a response right away (I usually pop on here every year or so, and then fade away again...), but someone will usually help. The manuals can be incredibly helpful for bolt torque info, diagrams, disassembly tricks, etc.

What are your plans with the bike?

Camelman
1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline Redline it

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Re: nuther 76 cb400f SS T-Chain Slipper question
« Reply #5 on: August 26, 2015, 03:06:21 PM »
Thank you camelman, I did better than getting a manual for her, I traded her in.
This site is a monster site, I wouldn't ask the questions but I can tell that there are some seriously high quality riders here with loads of experience. I do appreciate the heck out of it. It's relevance both ways. I wouldn't trade this site in. I have all those downloaded manuals from this site, it's why I found this site!

The motor: It's a long story I won't tell it all. I'll summarize it short. I bought 1 1976 cb400f SS red tank in 1980's totally sweet, for $400.00 it had under 1000 miles. I put over 30k on it. Sometimes with 5 yr breaks and no storage prep, never. I also got a another 76 cb400f SS yellow tank in the 80s, guy across the street was moving I asked him if he wanted to sell it, he gave it to me. it looked thrashed, obviously he had no idea how to maintain it. I parked it in the backyard never looked at it. 

2005 riding my red one back and forth to work 90 miles each way (60mpg wide open both ways, yeah!), i lost power and nursed it home, without any process of elimination I took the motor out,  I went in the back yard and pulled the one parked motor, swapped carbs and the motor took me to work the next morning. head gasket leaks a little more than I like it to.  It might of been an all nighter!

Later that year I parked it. in 2009 the carbs were plugged a slide was stuck and one main jet post had eroded almost to the o-ring so I pulled a carb off the other bank put it in and left it in a pile on the bench till 2015 got the carbs back on and working. Looking at the rolling frame in the backyard and seeing restorations on this site, I looked at the bike, it has 1800 miles on it. HOLY DAMN! So I'm going through that, the motor I'm working on is for practice in changing the head gasket in the motor put in my rider bike. I'll eventually put each motor back into their original cradle. The one I'm working on there's nothing wrong with it, I'm blown away by what it looks like after 30k. The slipper and tensioner isn't anything like I expected to be. I'll look at the rings, and put it back together.

I got 2 cb400f ss bikes, 84 xr500R, IT250F with YZ components, no wife no more! And I don't work any more, no income, and no bills, and scuba dive my butt off in Southern California. I didn't try to land paradise, I honestly tried the traditional way of living, wife and kids house, work, like the bike in backyard I accidentally discovered what I have. lol.



Offline Redline it

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Re: nuther 76 cb400f SS T-Chain Slipper question
« Reply #6 on: August 30, 2015, 01:46:09 PM »
well it turns out the cam bearing journals on the cam in the centers have wear marks on one side, the two journal marks as in lines are off set some degrees, the outers are slightly (very slightly) rough with marks. The head cam journals in the centers are worn through the coating and appear to be wearing on one side is all. I'm hoping that means I have a lot of time to go on it considering the other half is still good. And about getting the slider out, and honda manuals not being clear on HOW to get it out by wiggling it sideways, they also didn't mention the damper in the bottom might fall out into the crank case. Found that on the "Improve cam chain problems" update inte download manuals section. All good, I think the head gasket is still good for a spare! Time to pull off the barrel.