Navigation

You are here: Home / Messages / Singles / ES2 Engine problems

ES2 Engine problems

Up to Singles

Re: ES2 Engine problems

Posted by Andy Marks at December 29. 2016

The finished item in place and connected up. The 12mm pipe is too big to get a normal fitting that close to the case, so I made a special fitting that uses a jubilee clip to pull the thin walled union that's had slots cut down the sides in to clamp the 12mm tube. So far so good.

Attachments

Re: ES2 Engine problems

Posted by Andy Marks at December 29. 2016

And finally with the primary chain case in place its virtually out of sight. Just a glimpse of the rubber pipe.

Now what can I play with next?...

Andy

Attachments

Re: ES2 Engine problems

Posted by Paul Knapp at December 29. 2016

Fingers crossed for Dan's problem, but Andy, if you fit an oil seal behind the inlet cam sprocket, you will be running the maggy chain dry! I fitted a small round plastic catch bottle zip tied to the frame rail  and out of sight in front of the gear box to catch the occasional drop of oil.

Re: ES2 Engine problems

Posted by Dan Field at December 29. 2016

Thanks guys, I was using lose fitting fibre washers on the banjo, having them fit tight to the bolt will help because as you say at the moment the holes are superfluous! Not sure if there's room for an o ring but will have a look, otherwise I'll make a couple of tight fitting washers.

Andy thats a sophisticated catch tank! Mine is a trials bike so I'll run the breather up under the seat and fit it with a small k and n type filter.

Re: ES2 Engine problems

Posted by steven lewis at December 31. 2016

Previously Dan Field wrote:

Thanks guys, I was using lose fitting fibre washers on the banjo, having them fit tight to the bolt will help because as you say at the moment the holes are superfluous! Not sure if there's room for an o ring but will have a look, otherwise I'll make a couple of tight fitting washers.

Andy thats a sophisticated catch tank! Mine is a trials bike so I'll run the breather up under the seat and fit it with a small k and n type filter.

HI Dan,

The piston Oil ring for the GPM piston is designed to go one way only. The rings are normally fitted when they arrive but I have on a few occasions found them up side down. I have attached a picture of the rings correctly fitted...NOTE the taper to the top. Cheers

Steve

Attachments

Re: ES2 Engine problems

Posted by Dan Field at December 31. 2016

Damn, didnt spot or check that, although I looked carefully for any marking that said top! ( there weren't any) the ring has been off too. At this point I wish it was a two stroke, I'd be able to check through thevexhaust port. Looks like it's head and barrel off again time!

Re: ES2 Engine problems

Posted by Dan Field at December 31. 2016

Head and barrel off, piston checked - (good news the oil ring was the right way up) and back together in 20mins, getting quick at this!

Sorted out the breather and routed it up under under the seat, put the head oil feed into the oil tank. Drained the sump, refilled the tank. fiddled for a bit and she started with no smoke .... result! But there is quite a lot of valve gear noise. Will reconnect the oil feed tomorrow with tight fitting washers and report back.

Re: ES2 Engine problems

Posted by Dan Field at February 13. 2017

Hmmm, not as good as I had hoped, the bike isn't smoking noticeably, but I took the head of again today ... still chasing the top end noise .... and sadly found oil on top of the piston, nothing like it was but still there.  I put it back together and disconnected the head oil feed (stuck the outlet in the oil tank ) and rode it around the field.  Brought it in and wiped the head off again. There was still oil on the piston. There was also quite a lot of oil on the head that had seemingly been blown out of the oil feed hole.

So to recap its been rebored and fitted with a new Gandini piston (I've also tried a new heptolite, but that was no better). The piston clearance has been checked and is 6 tho. Ring gaps are a bit wide but nothing too scary. Compression is good.  I've taken the ball out of the crank breather and vented it under the seat. I've tried running it with oil to the head, reduced oil to the head and no oil to the head!  Oil pump is returning oil nicely to the tank and appears to be scavenging effectively (but I haven't tried draining the sump after a ride to double check).

Apart from top end noise when hot the engine starts and runs well, ticks over nicely and picks up as it should.

Any ideas ? Might ring Mike P tomorrow.

Re: ES2 Engine problems

Posted by George Phillips at February 14. 2017
Do let us know the result of your phone call, Dan. This one has me intrigued. George

Re: ES2 Engine problems

Posted by christopher_shepperd at February 14. 2017

G'day Dan.  We spoke at the Bristol show when you were hopeful that the problem had been solved.  Any recent news?  Cheers....Chris

Re: ES2 Engine problems

Posted by Dan Field at February 14. 2017

Hi Chris, sadly not! I was premature, although its not like riding a bonfire any more it still has oil on the piston. I didn't get a chance to speak to Mike P, maybe tomorrow.

Dan

Re: ES2 Engine problems

Posted by George Phillips at February 15. 2017
Hi Andy - what do you have in mind for the oil seal behind the mag drive sprocket? George

Re: ES2 Engine problems

Posted by colin_mosley at February 15. 2017

George. A quick share of your hijack of Dan's thread.

I used felt for making oil seals available in sheet form in different thicknesses from www.vintagecarparts.co.UK. nice and compressible.

In theory you shouldn't need a seal but as they say, every little helps.

Dan, if you have starved the oil from the top end, it has to be coming up past the rings. Assuming that you can't have two duff pistons, this limits it to clearances, surface finish of rebore, alignment (bent rod, bore not parallel with vertical axis of engine) excessive oil in crankcase which is unlikely as you have drained the sump or a breather problem. With the engine running can you feel the breather working?

Colin

Re: ES2 Engine problems

Posted by christopher_shepperd at February 15. 2017

I don't suppose it's just a bit of oil that runs down after the engine has stopped is it?  Perhaps you could do a check of actual oil consumption.  It could also be the need to run the piston in.  Just my two pen'orth.

Powered by Ploneboard
Upcoming Events
Norfolk branch camping weekend May 12, 2017 - May 14, 2017 — Whitwell and Reepham railway station, Reepham, Norwich NR10 4GA 01603 871694
CRMC Track Parade - Mallory Park May 20, 2017 - May 21, 2017 — Mallory Park,Church Rd, Kirkby Mallory LE9 7QE
Surrey Branch at the Kempton Park Classic Motorcycle Show & Auto-jumble May 20, 2017 09:30 AM - 04:00 PM — Kempton Park, Staines Road East, Sunbury on Thames, Middlesex TW16 5AQ
Tay Valley Branch - lunch meeting May 21, 2017 11:00 AM - 04:00 PM — Ben Lawers Hotel,Loch Tay, Aberfeldy, Perthshire, PH15 2PA
Yorkshire Branch at the Sowerby Bridge Classic Bike & Scooter Show May 28, 2017 10:30 AM - 04:30 PM — The Wharf, Sowerby Bridge HX6 2AG
Upcoming events…
This is Brio Diazo Plone Theme