W/E 20th October

Prodigal son returned

Prodigal son returned

The Atlas is back!

Delivered via courier van from Glasgow the Atlas has returned. Unfortunately the key wasn’t in the bike so it can’t started but this hasn’t stopped me having a poke about to see if there is something in the motor I’ve missed and can fix without a complete engine swop.

Took off the alternator case and can see that the Zane sprag has some side to side play which I can shim out. It might have made the noise but then it was like this from the outset so unlikely – but worth putting right for when it does run again. I checked over the balancer shaft and this is fine, no play or loose cogs. Next weekend I will strip out the primary side but this was taken apart in Glasgow and nothing found. I really need to get the thing to go again…

So Plan A – it isn’t really broken has yet to be fully explored.

Plan B – refurbish the original engine is progressing. Word came back from the engineering firm working on the head and barrels that fresh piston rings have arrived and the bores are okay following a light hone. The head has a new inlet valve seat and refaced valves. I had to supply some fresh valve stem seals (on both inlet and exhaust for the eight valve engine) which at £6.95 + VAT and postage will add an additional bill of around £100! Interestingly the seals Slater Laverda is sending are from a Honda and need a tad of Loctite 407 to fit (OCT in Germany supply the seals [presumably not Honda] for just €4,52 each).

To add the finishing touches I need a tube of Loctite 518 to seal the crankcases, three oil seals, piston ring clamps and a fresh set of allen bolts for the cam cover and outer cases – luckily the Kempton Autojumble is this coming weekend. I’ve also repainted the crankcases with cylinder black (handpaint so not a great finish but cheap and it’ll keep the road salt at bay).

Awful hand paint job...

Awful hand paint job…

Plan C – register my imported Mk 3 is stalled while I wait for someone to come back from the Continent so I can claim it is a recent import and avoid a £5 per day import ‘fine’…

Crank in a box

Crank in a box

All the action hasn’t been solely Atlas related as the deal with the Atlas was to also send down a rebuilt crank. The above is as delivered by Keith Nairn. I had a nasty shock at the state of the crank which had been sat under the bench and looked and felt okay to me. Keith reported that he had to replace three cheeks. The centre section 4 with cam drive had spun it’s main bearing rendering the mainshaft no good, centre section 5 had damage to the crankpin and the drive side crank end had been eaten away by the connecting rod! Just shows if you don’t know what you’re looking hey – I’d considered putting it in the RGA as was!!!

I also got feedback on the rebuilt Jota crankshaft – as Keith says  ‘If a 180 crank is in phase the ground steel bar should pass easily through all three little end eyes, as you can see from the picture…..

all the rods should be vertical...

all the rods should be vertical…

Just keeping looking forward and never check just how much money you’ve spent!

Nick 🙂

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s