R26 Restoration by new member from Australia

Begonnen von grahamjb, 01 Oktober 2017, 06:42:07

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grahamjb

#330
I finished wiring the bike today, made a new axle for the rear brake adjust lever, tightened up all the nuts and bolts and put oil in all three holes.

I then went to fit the new exhaust pipe and discovered that it doesn't fit because the flange at the head end of the pipe is too big for the new exhaust pipe nut.....but guess what, the nut is too big to screw onto the head.....one step forward three steps back again.....sort of expected now.

I fitted the old exhaust pipe and nut and made up a temporary fuel tank from an empty Baked Beans can; put some petrol in the can and kicked the bike over over....a few encouraging fires and then the bike fired up which I was happy with until I noticed oil running down the right hand side of the motor. The oil was leaking from the head gasket at a reasonable rate so I switched off the bike and ripped off the head.

Not happy with the oil leak and after removing the head it is obvious why oil is pissing out.....the head gasket doesn't seal the oil groove in the head. Check out the attached photo and you will see that one "O"  ring in the middle will not seal along the length of the of the oil groove.

Can someone please advise where I can buy the correct head gasket for this bike or do you have to glue the head gasket on? Having an "O" ring on the head gasket in the middle of the oil groove makes no sense to me.

Two photos below....the first one attempts to show the oil leak with the engine running but it is hard to see. The second photo shows the head and head gasket and why it leaks oil.

grahamjb

#330


Borgward

Is there any reason for this chanel?

grahamjb


4Taktix

I think it's an abbreviation for the oil, in case the stock-routing throgh the Rockerboss-seats is clogged.
But it's a bit odd, that this was only done for the outlet-rocker.
Maybe the pre-owner wanted to achieve more cooling there, as it get's hotter than the intake-rocker.
Just an idea.

Regards,
Sascha
Think outside the box !

grahamjb

I haven't seen any other R26 heads so I don't know what is factory or modified - I would think a head gasket without the "O" ring would seal better on the channel.

4Taktix

I personally prefer the head gaskets without O-rings in general, as the Headbolts can be tightened with the stock torque.
O-Ring-gaskets require more torque up to 60 Nm, which may "squeeze" the Head around the bolts.
You can notice that, when the bolts are hard to insert, until they reach the thread.
However, I'd pull the Rockerbosses out and clean the channels inside then and also in their seats (if not yet done) and take a stock gasket.
I'd also block this "Custom-Channel" with an appropriate piece of an old O-Ring e.g. or any heat-proof putty/sealant.

Regards,
Sascha
Think outside the box !

grahamjb

Thanks for the reply Sascha and the rocker bosses are all clean.

Have just looked at Salis's site and they sell head gaskets with and without the embedded "O" rings. Interestingly a minimum head torque of 50Nm is quoted for the head gaskets with the "O" rings which translates to 37 ft pounds.....12 ft pounds more than the factory 25 ft pounds that I torqued my head to.

I will order a new standard gasket and as an exercise I will re-torque the head to 37 ft pounds tomorrow and see if it stops the oil leak.

Cheers

bwprice100

Graham, here is a picture of the reconditioned head to go on my R26.

I hope it helps.

Sent by me using tapety talky

Heiko

Hi Brian,

whats that for a ridge in your cylinder head?
Ariel motorcycles... upon which the sun never sets.

bwprice100

Zitat von: Heiko am 21 August 2018, 17:56:03
Hi Brian,

whats that for a ridge in your cylinder head?
Just a small mark that the camera has distorted and made look very deep.

Sent by me using tapety talky


Heiko

Ariel motorcycles... upon which the sun never sets.

bwprice100

Zitat von: Heiko am 21 August 2018, 18:36:07
Okay,

approved.  ;D ;)


Heiko
Thank you kindly Sir. :) :)

Sent by me using tapety talky


Heiko

Ariel motorcycles... upon which the sun never sets.

grahamjb

Thanks for the replys guys, it seems that I might have to weld up the non standard section of channel on the head.......I still don't understand why the gasket maker put on "O" ring on the hole over the channel.

Cheers

grahamjb

Decided to not weld the modified channel in the head because the holes at each end of the channel go into the head bolt tubes  and I don't think it would make a difference if I could get a gasket that would seal properly; i.e. without the neoprene rings on all but two head bolt holes.

By chance a specialist BMW dealer here in Perth had an R25 gasket without the neoprene rings so I went and bought it. When I got home it didn't fit over the barrel lip because the gasket bore size was 74mm whereas the the R26 gasket (with the neoprene rings) has a bore size of 79.5mm. Easy fix - I marked out the R25 gasket bore using the R26 gasket as a template and used a sanding drum to enlarge the gasket bore size to 79.5mm.
Whilst modifying the R25 gasket I observed that both gaskets are not a great fit around the pushrod tube holes and the R26 gasket is worse than the R25 gasket - see photo Poor Gasket fit.

I refitted the head using the modified R25 head gasket, put some more petrol in my Baked Beans petrol tank and started the bike. I kept the revs high to keep the oil pressure at maximum while checking for a repeat oil leak.

All was good so the next job is to recheck the head bolt torque, tune the carburettor, recheck all fasteners for tightness, fit the petrol tank and go riding I hope.

Photos below including a poor video that shows the bike engine running.




bwprice100

Sounds good. :)

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grahamjb

Thanks Brian - Tuning the carby may prove interesting  :)

OldsCool!

Congratulations Graham! Almost done!

The poor fit of some gaskets is a known pitty. Now let's finish it for a ride!!!

BR

Steffen
Ich bin auf dem Dorf aufgewachsen. Ich wurde nicht erzogen, ich habe ÜBERLEBT!

grahamjb

Thanks Steffen....I am keen to get it out on the road  ;D

grahamjb

Am still finishing off little bits and pieces & nearly have the bike finished.

Spent ages making the new front exhaust pipe fit - the flange angle at the head end of the pipe was incorrect resulting in the pipe kicking out from the side of the bike by the width of the pipe where the muffler joins. I only had two options to fix this; I could re-bend the pipe and crack the chrome plating or rework the flange at the head end of the pipe and hope that I don't damage the chrome plating. Obviously I chose the latter option. I taped a line identifying the 3.5mm section of pipe that had to be reworked and did a series of cuts in the flanged end (that had been ground down to fit inside the exhaust pipe nut) and then made a new flange section on the end of the pipe using a ball peen hammer whilst supporting the pipe on foam and my lap to prevent damage to the chrome plating. It took ages to do and the pipe now fits up nicely to the head and the side of the bike (see photo "exhaust pipe mod"). The finished pipe flange isn't clear in photo "EP modded" but hopefully you can make out that the flange is on an angle and that there is also a pipe section coming from inside the pipe that locates inside the head to ensure correct alignment. Photo "EP on the Bike" shows the new exhaust pipe on the bike using the old exhaust pipe nut to hold it in place.

Went to bolt the tank on and discovered that the "new" front tank bolt is too short - see tank bolt photo and you will see that the bolt does not protude where the nut should go....

The other photos show the current state of the bike with the tank sitting in position.

grahamjb

Here are the other photos and my apologies if they are upside down; they are the correct way up on my computer....I cannot fix this as I am from down under.

Herculestom

Graham,

as you know I am following you and your restoration since long time. Congrats!!! Very, very well done.  :respekt: :respekt: :respekt: Watching the progress over time I knew the result would be something like this. I'd say, an impressive piece of art with creative solutions, systematically done with the right technical brain. Did you start her already or will this be the weekend fun? You must film it. I'd like to be there.

Regards
Tom

PS
By the way I was able to look at your photos from the right angle, not upside down. I guess I am also down under here.
umuntu ngumuntu ngabantu

OldsCool!

Graham, what a beauty!!! My biggest respect for your creative diy solutions and letting us participate on every detail. I hope you can enjoy riding soon, and same as building it up  :D

best regards

Steffen
Ich bin auf dem Dorf aufgewachsen. Ich wurde nicht erzogen, ich habe ÜBERLEBT!

bwprice100

Brilliant.  :)

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grahamjb


grahamjb

Went for a test ride up and down my street today - still have to adjust a few things but overall the bike rides ok




Herculestom

Graham,

fuckin' cool! She's running.  :applaus: :applaus: :applaus: and  :respekt:

You can be very proud. I wouldn't worry about the remaining adjustments. The final carb setting is nothing difficult, but time consuming. The only thing you need is a handful of nozzles, some tools, a flat road, a digital speedometer (perhaps your cell phone will do) and about half a day to waste for it.

Good luck and all the best wishes from Africa!
Tom
umuntu ngumuntu ngabantu

OldsCool!

Graham!! On the road!! Congratulations, what a moment. I'm sharing the thrill with you  :juhuu:
Ich bin auf dem Dorf aufgewachsen. Ich wurde nicht erzogen, ich habe ÜBERLEBT!

bwprice100

Sounds very smooth Graham and congratulations.  :)

Sent by me using tapety talky


grahamjb

Thanks fellas, went for another couple of short rides today after a bit of carby tuning, clutch and brake adjusting and have now racked up a massive 11km on the odometer  ;D

Was coming down the street and the wife was out the front with her iPhone - two more short putt putt videos of the bike in motion and this time I am wearing a helmet.......even got the bike up to 60km/h





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