Author Topic: Black Jack 1978 K8 750cc (Read 19932 times)

Familyvan · « **Reply #50 on:** August 15, 2013, 05:11:13 PM »

Yes I have a small oil cooler going on the front of the bike

Not the best picture but you get the idea.

Familyvan · « **Reply #51 on:** August 18, 2013, 04:21:35 PM »

Engine build coming along nicely. Hoping to have the barrels and head on tomorrow night.

Familyvan · « **Reply #52 on:** August 26, 2013, 12:55:32 PM »

So the next problem is as follows

The new conrods are rubbing on the bottom of the barrels

Do I trim the bottom of the barrel sleeves

Or
Shave some off the con rods , however they have all been balanced ??

Please help

iron_worker · « **Reply #53 on:** August 26, 2013, 01:45:44 PM »

I would think it would be better to shave the barrels and try to keep all the strength you can in those rods. I'm not an expert though that just makes sense in my head. The bottom end of the barrels aren't subject to a lot of load ... the rods are.

IW

Familyvan · « **Reply #54 on:** August 26, 2013, 01:57:21 PM »

Thanks Iron, I've just got a text back from my engineer and he suggests the same.

So that's what I'll be doing. Hopefully

Familyvan · « **Reply #55 on:** August 27, 2013, 12:33:35 PM »

So I notched the 2+3 sleeves but notice a slight rubbing from the 1+4

So I ended up notching all 4

Engine now turns over freely

Onto the next problem that turns up lol

KrautKoffin · « **Reply #56 on:** August 27, 2013, 01:23:31 PM »

Quote from: Familyvan on April 01, 2012, 01:07:01 PM

What am I missing here? Did you just cut it and put in a sleeve with Allen screws to hold it in? Pardon me for being dense

iron_worker · « **Reply #57 on:** August 28, 2013, 11:28:27 AM »

Quote from: Familyvan on August 26, 2013, 01:57:21 PM

Thanks Iron, I've just got a text back from my engineer and he suggests the same.

So that's what I'll be doing. Hopefully

Interesting ... I'm also an engineer. lol

Just make sure those edges are deburred so the rings don't catch on them as you're installing the cylinders.

IW

Jayhawk · « **Reply #58 on:** August 29, 2013, 06:01:22 AM »

Quote from: iron_worker on August 28, 2013, 11:28:27 AM

Quote from: Familyvan on August 26, 2013, 01:57:21 PM
Thanks Iron, I've just got a text back from my engineer and he suggests the same.

So that's what I'll be doing. Hopefully

Interesting ... I'm also an engineer. lol

Just make sure those edges are deburred so the rings don't catch on them as you're installing the cylinders.

IW

I agree; make that 2 engineers. There must be a joke there somewhere.

As IW advised, make sure the inner edge of the sleeve is carefully chamfered \ deburred, as it would suck to catch a ring, or more likely, scratch the ring surface during assembly, and end up with compromised ring seal.

Familyvan · « **Reply #59 on:** August 30, 2013, 11:56:20 AM »

What is the length of the 4 bolts shown in figure 12 ?

Thanks having a nightmare finding them.

Familyvan · « **Reply #60 on:** August 30, 2013, 01:15:35 PM »

Thanks for the advice regarding de blurring the barrel sleeves all done thanks

Next problem

I didn't make a not of which cam carrier went where.

New cam is being fitted.

Any tips or advice.

KrautKoffin · « **Reply #61 on:** August 31, 2013, 01:10:30 PM »

Quote from: KrautKoffin on August 27, 2013, 01:23:31 PM

Quote from: Familyvan on April 01, 2012, 01:07:01 PM

What am I missing here? Did you just cut it and put in a sleeve with Allen screws to hold it in? Pardon me for being dense

Guess so..

LesterPiglet · « **Reply #62 on:** August 31, 2013, 02:27:56 PM »

^^^ Gordons Frame Kit.

Familyvan · « **Reply #63 on:** August 31, 2013, 02:39:31 PM »

Yes a Gordon frame kit.

Simple design , easy to instal make removing the engine a lot easier.

KrautKoffin · « **Reply #64 on:** August 31, 2013, 02:41:33 PM »

Quote from: Familyvan on August 31, 2013, 02:39:31 PM

Yes a Gordon frame kit.

Simple design , easy to instal make removing the engine a lot easier.

Sweet

Familyvan · « **Reply #65 on:** September 01, 2013, 02:07:18 AM »

I think I bought it from cycle X

754 · « **Reply #66 on:** September 01, 2013, 07:26:47 AM »

Yes a bit different than the Gordon kit.

Familyvan · « **Reply #67 on:** September 01, 2013, 11:55:45 AM »

Well I have built up the engine to getting the cam in. I have managed to get the timing right. I think. But when I have gone to put the can wheel onto the cam the cam chain is too tight

I have not installed the cam tensioner yet!

Any ideas. I'm hoping it not the cam chain come off at the bottom on the crank. I have turned the engine over and the cam chain does move.

Any ideas please.

Familyvan · « **Reply #68 on:** September 01, 2013, 12:44:56 PM »

Panic over I applied a little pressure then it went on!!

However I forgot the locating dowels for the cam holders so it all has to come off. Lol

Familyvan · « **Reply #69 on:** September 03, 2013, 01:27:24 PM »

Now bear with me. If you've been following my thread you'll see I'm a complete idiot an new to engine building

I thought I had the cam in the right way, but when I came to do the valve adjustments I noticed that the no 4 port where down when the cam love is up. Should the no.1 lobes be down??

LesterPiglet · « **Reply #70 on:** September 03, 2013, 02:34:25 PM »

Rotate the engine another 360.

Familyvan · « **Reply #71 on:** September 04, 2013, 01:03:08 AM »

Thanks lester, I suspect I should be feeling like a plum right now.

Thanks again.

Familyvan · « **Reply #72 on:** September 06, 2013, 02:49:09 AM »

Familyvan · « **Reply #73 on:** September 12, 2013, 08:37:40 AM »

So I finished last night but had to get up with the kids so had a few hours to kill decided to drill the rear disc

Downloaded a pattern off this forum and set too

Template mounted on disc

Rear rotor drilled and placed in lathe to de bur with sandpaper

Completed produced. Only took an hour of drilling.

Familyvan · « **Reply #74 on:** September 12, 2013, 12:26:51 PM »

Rear wheel now in. Still waiting for new pistons for rear caliper

News:

Author Topic: Black Jack 1978 K8 750cc (Read 19932 times)