Interchangeable Flywheel?

othercarsaford · #1 (**permalink**) 10-12-2006, 07:04 PM

It's time for a new clutch in my '68 Spider Junior. I will need a new rear main seal, so I am going to have the flywheel reconditioned. Rather than waiting until I got the flywheel off, I was thinking I would have a machine shop recondition a flywheel I already have on the shelf that I took off of a 1300cc 105 motor out of a 1970 Giulia Sedan (same 00530 prefix on the motor, but a later motor obviously). That way, I could even have the new driven plate and pressure plate balanced with the flywheel on the bench before I even take the gearbox off and save me in total downtime.

Problem is, I don't have a book that will tell me if the two 1300 flywheels will be interchangeable. I suppose they could even be the same part, but I can't find out without some assistance.

The 1300 flywheel I have from the '70 Giulia is part no. 105410240000. My Duetto manual (1600 motor, but with the same mechanical clutch set up as my Junior) specifies a flywheel 105000204001. I don't have a manual (even my original-issue specs manual for the Junior) that shows me what my Junior's current flywheel part number is.

Can anyone help me out?

Thanks in advance.

Thomas Watts

**George Willet** · #2 (**permalink**) 10-12-2006, 08:39 PM

They are interchangable, altho my checking shows the 1300 flywheel at 18 lbs, and the 1600 fly wheel to be one pound heavier.

othercarsaford · #3 (**permalink**) 10-13-2006, 07:51 AM

Thanks, George. I guess I was also concerned because I thought the later flywheel might only accept the pressure plate from the hydraulic cars, while my car has the older, mechanical actuation like a Duetto. Does that affect your answer?

Thanks again for the quick reply.

**George Willet** · #4 (**permalink**) 10-13-2006, 09:21 AM

1750 engines use the later diaphram pressure plate, and must use the hydralic bell housing as the ring gear is larger in diameter.

**Andrew** · #5 (**permalink**) 10-13-2006, 01:10 PM

I believe very late 1300s and 1600s (by US standards; post 1970?) will use the 1750/2000 diaphragm type clutch if they have the hanging pedals and hydraulic clutch master cylinder. This would be after 1300s and 1600s stopped getting imported to the US.

Andrew