6 speed first motion shaft too long?

[p.mole1]

My first motion shaft is too long?, the 1.4 crankshaft has a much longer drilling for the spigot bearing. I am trying to mate the gearbox to a 1.8 and it won't fit, the drilling for the spigot bearing is too short?.

It looks like I will need to remove at least 10mm maybe more. I haven't measured it accurately yet. Has anyone managed to do this with a grinder, I will also need to regrind a taper on the nose of the first motion shaft.

[Wrightpayne]

Most Ks have a short input shaft - lots in the archives about chopping them (and 5 speed ford boxes in a K).

You're best with a 1-2mm chop disc available at most DIY outlets - screwfix, tool station etc.

Measure twice cut once !

Ian

[Wrightpayne]

PS is the new K engine sourced from a seven or a rover? If the latter you'll need a sleeve and ford spigot bearing.

Ian

[oilyhands]

Well known mod when going from 1.4/1.6 to 1.8, approximately 12mm needs removing, a small chamfer on the nose is of benefit to help locate into the spigot bearing. You must fit the spigot bearing and sleeve into the end of the crank too.

Oily

[p.mole1]

Thanks, the engine was originally from an Elise but the guy I bought it from was going to put it a 7 and had already done the sleeve and spigot bearing. I must admit to being nervous about attacking my gearbox with chop disc.

My car has been retro fitted with a light weight flywheel (1.4 SS) the clutch plate looks new and I was going to reuse this along with the pressure plate and new CRB. Will the pressure plate be able to cope with the larger capacity engine. The pressure plate has no manufacturers name just made in Great Britain and QY13000  and 2301 stamped on one of the springs

[Englishmaninwales]

I used all the 1400 clutch components when I fitted an 1800 (the pressure plate is still fine 13 years and hundreds of hillclimb starts later).

Cutting the spigot is very straight forward, measure twice and wear eye protection.

Malcolm

edited to add, just in case you were unaware, the original 1400 LW flywheel from Caterham  (and original Rover item) has a different trigger pattern for the ECU. Not a problem if you are using a re-programmable ECU such as Emerald, but it won’t work with a later Rover ECU.

[SLR No.77]

I did the same, very straightforward.

Stu. 

[p.mole1]

Thanks, first motion shaft cut and chamfered, I only needed to cut 10 mm off. I have bolted on the pressure plate, clutch and fitted the gearbox and all seems fine. I able to turn gearbox output shaft when in gear with clutch depressed so It seems I have enough clearance.

[Englishmaninwales]

See my edit above about your 1400 flywheel.

Malcolm

[p.mole1]

Yes thanks Malcolm I will use my existing pressure plate and clutch.