wrong clutch?

[jon521]

when i bought my 521 back in febuary, the PO gave me an extra clutch that he said is for my truck. This was a used clutch and i decided that if i was going to go to the trouble of replacing it, i would want something new in there. so i recently bought a clutch from Schucks, and compared it to the one the PO said was for my truck and they were different. the one from schucks was smaller than the one from the PO. im just trying to figure out if schucks sold me the wrong clutch, or if the PO told me wrong? I have a stock L16 with 4 speed.

 

the one on the left is the one i bought from schucks

 

the one i bought from schucks

 

the one from the PO

[datzenmike]

The stock one should be 200mm across the friction disc so likely Schucks sold you the correct one and the PO was mistaken. The larger one is likely a 225mm one for the later L18 and L20B truck motors.

 

No, you cannot use the larger one. The flywheel determines the clutch size that can be used. Well if you can find the rare '74 truck 5 bolt L18 flywheel you could.

[H5WAGON]

As soon as you get that transmission off, it should be real clear....:D Are you doing it before Blue Lake?

 

 

 

mmmmmm New clutch!

[banzai510(hainz)]

use the Schucks one. its a 200mm like stock 510 and 521s

 

make sure the clutch is adjusted at the slave before swapping it out just to make sure.

 

if flywheel is scared I would highly advise to get the flywheel resurfaced.( i learned the hard way)

[jon521]

Thanks!

 

ya my slave cylinder is adjusted all the way out, there is hardly anything left on it :hmm:

and for the warenty on it to be enacted i have to have my flywheel turned.

 

I havent decided if im going to blue lake yet. i really want to but i have yet to take my truck past 60 mph for more than 5 mins.....

 

 

[jon521]

so this doesnt have to do with the previous problem, but i just got an L20b and a 300mm 6 bolt flywheel that says A87 on it. the flywheel didnt originally come the engine, so i am wondering what clutch i should buy?

[datzenmike]

No such thing as a 300mm L20B flywheel.

 

Here's an L16/L18 200mm flywheel. Measure across the shiny clutch disc contact area.

 

 

Here's a 240mm flywheel that was actually on an L20B from a 720 4x4.

 

[jon521]

i measured the whole thing, i will go and remeasure correctly now.

 

uummm this is a datsun flywheel right? i cant get a measurement that is 240 or 200. more like 230?

[datzenmike]

Truck L20B flywheel... 225mm.

[jon521]

oh sweet thanks, what was i doing wrong? haha

[datzenmike]

They come in 200, 225 and 240mm size. It's definitely NOT 240mm so the closest is 225mm.

[wayno]

Datzenmike, what is the biggest flywheel made that will bolt onto a L20b? I have one that the clutch cover barely fits onto the flywheel, I beleave the flywheel is off a 86ish 720 truck, and the clutch cover/disc are huge.

[jon521]

They come in 200, 225 and 240mm size. It's definitely NOT 240mm so the closest is 225mm.

 

 

sweet thank you, king rat! one more thing, what vehicle came with these flywheels so i know what clutch to order?

[datsunaholic]

The L-series flywheels are all the same diameter, it's the clutch/pressure plate diameter that's different. Mike already said above- only sizes were 200mm, 225mm, and 240mm.

 

The 720 trucks with the Z24 used the 240mm clutch. It'll fit a L20B but not all L-series transmissions have enough clearance, and you'll need the matching throwout bearing collar for the clutch.

[datsunaholic]

sweet thank you, king rat! one more thing, what vehicle came with these flywheels so i know what clutch to order?

 

200mm: All L-series 521s, 510s (both PL510 and A10), 610, 710, '72-73 620, '77-79 200SX.

 

225mm: 74-79 620, '80 720, 240/260/280Z, 280ZX non-turbo 2-seat, '80-83 200SX, all 810s.

 

240mm: 280ZX Turbo, 280ZX 2+2, 83+ 720.

 

I don't know about 81-82 720s (Z22). I think they used 240mms.

[jon521]

200mm: All L-series 521s, 510s (both PL510 and A10), 610, 710, '72-73 620, '77-79 200SX.

 

225mm: 74-79 620, '80 720, 240/260/280Z, 280ZX non-turbo 2-seat, '80-83 200SX, all 810s.

 

240mm: 280ZX Turbo, 280ZX 2+2, 83+ 720.

 

I don't know about 81-82 720s (Z22). I think they used 240mms.

 

 

sweet i will just go get a 79 620 clutch then, because i believe thats what the engine came out of.

[wayno]

The L-series flywheels are all the same diameter, it's the clutch/pressure plate diameter that's different. Mike already said above- only sizes were 200mm, 225mm, and 240mm.

 

The 720 trucks with the Z24 used the 240mm clutch. It'll fit a L20B but not all L-series transmissions have enough clearance, and you'll need the matching throwout bearing collar for the clutch.

 

Thanks, since I run 85-86 720 5 sp. shortshaft transmissions, the big discs/covers are not an issue. I was asking because I have never seen a flywheel(except the one I have) with the clutch cover bolts so close to the edge of the flywheel before, the clutch cover I have was the same size as the flywheel iself, never seen that before, guess I should have kept all those Z24 block flywheels I scrapped out with the blown engines.

[wayno]

sweet i will just go get a 79 620 clutch then, because i believe thats what the engine came out of.

 

Take the flywheel with you when you buy the kit, they will measure it at the parts store.

[datzenmike]

200mm: All L-series 521s, 510s (both PL510 and A10), 610, 710, '72-73 620, '77-79 200SX.

 

225mm: 74-79 620, '80 720, 240/260/280Z, 280ZX non-turbo 2-seat, '80-83 200SX, all 810s.

 

240mm: 280ZX Turbo, 280ZX 2+2, 83+ 720.

 

I don't know about 81-82 720s (Z22). I think they used 240mms.

 

Doug I think the Z22s were all 225mm... but I've heard that all 4x4s had 240mm regardless of motor? I did pull a 240mm from an '80 4x4 with the L20B but the motor had obviously been swapped. After all these years lots of parts got moved around.