raggmann Posted July 1, 2015 Report Share Posted July 1, 2015 Need some quick help and don't have time to search I have my '72 521 (1.6L) apart and just dropped in my 1.8L outta the donor '74 620. The clutch is binding against the bell housing and I can't budge the crank pulley. I pulled the engine again and found rub marks inside the bell housing. Can I just use the flywheel and clutch off the 1.6 on the 1.8? I see the pressure plates are doweled in a different position between the two but if the 1.6 assembly will work on the 1.8 then that'll save me having to swap the tranny's while it's apart. I'm ok swapping the tranny's tho but I'm concerned that I'll have to modify the drive shafts. Can anyone shed a little light on this? I'd like to get it done asap Thanks, Quote Link to comment
Doctor510 Posted July 1, 2015 Report Share Posted July 1, 2015 Yup, change away You have other issues, somethings is amiss, nothing should rub. Clutch sizes may be different, FW are the same dimension wise. Quote Link to comment
datzenmike Posted July 1, 2015 Report Share Posted July 1, 2015 The L18 from the 620 uses a larger 225mm clutch. The only year that has a 5 bolt 225mm flywheel. Yes you can and should use the L16 200mm flywheel and clutch. Be sure to use the L16 release bearing collar with the L16 flywheel and clutch. They are matched to each other. The release collar is the thing that clips on the clutch arm and holds the bearing. The L18 collar will be a different length and matched to the 225mm clutch. I've heard that larger clutches will rub the 521's 4 speed but ... well good to know. Quote Link to comment
raggmann Posted July 1, 2015 Author Report Share Posted July 1, 2015 I took a picture with my phone but don't have the time to upload to photobucket. The pressure plate & clutch seem to be a bit bigger-like 200mm vs 225mm and the outside of the pp is hitting the bell housing. The 1.6 fw is doweled different than the 1.8 but I was concerned about balance issues using the 1.6 fw on the 1.8 Thanks Mike I'll post pics tomorrow Back to the barn Quote Link to comment
datzenmike Posted July 1, 2015 Report Share Posted July 1, 2015 No no no. Use the L16 flywheel and clutch... they are matched. The L16 clutch will not fit the L18 flywheel. It's made to fit a 225mm clutch, won't fit. Quote Link to comment
raggmann Posted July 1, 2015 Author Report Share Posted July 1, 2015 Yeah, that's what I meant........I'll use everything from the back of the crank off the 1.6 on the 1.8 Quote Link to comment
raggmann Posted July 1, 2015 Author Report Share Posted July 1, 2015 Does anyone know if the 521 & 620 4speeds are the same length? I'd rather have the larger diameter clutch discs Quote Link to comment
datzenmike Posted July 1, 2015 Report Share Posted July 1, 2015 The early L16 powered 620s ('73) were the same, but in '74 the longer 71B 4 speed was used. Both the 521 and the 620 use a two piece drive shaft. The front half on the 620 was shortened to use the longer 71B transmission. I don't know for sure if the 521 and the 620 have similar length drive shafts but if the difference is the different lengths of the two 4 speeds, (5.5") them maybe all that's needed is to swap the shorter 620 front drive shaft onto the 521. Daniel or wayno might know. Quote Link to comment
DanielC Posted July 1, 2015 Report Share Posted July 1, 2015 Or just go to a driveline shop, and get the driveline shortened. You will need a yoke that fits the transmission Quote Link to comment
raggmann Posted July 1, 2015 Author Report Share Posted July 1, 2015 Thanks guys. Got the flywheel changed to the 1.6 assembly and it all went in with no issues. BUT.... now I can't get it to start. Been at it 5-1/2 hrs and can't figure it out. The 1.8 was running when I pulled it and had great compression. That's what prompted this swap-low compression in the 1.6 It turns over great an wants to run but won't. Timings right, firing order is right, it just won't run. I've walked away at this point 'cause I'm tempted to drag it out back and use it for target practice or set it on fire Quote Link to comment
raggmann Posted July 1, 2015 Author Report Share Posted July 1, 2015 Now I'm thinking maybe it's the single point internal condenser distributor causing my grief. I think I'll swap the dual point, external condenser distributor off the 1.6 in. That's what the trucks wired for so..... Yes, eventually I'll be looking for a Matchbox but for now I gotta get this thing running Quote Link to comment
raggmann Posted July 2, 2015 Author Report Share Posted July 2, 2015 So here's the difference in the discs Here's where the pressure plate rubbed the bell housing when I turned the engine over by hand Here's what I'm up against trying to get it running now Any ideas ?? Quote Link to comment
datzenmike Posted July 2, 2015 Report Share Posted July 2, 2015 Take air filter off and look. Is the choke set? Pump gas several times. The choke should set on and the accelerator pump squirt gas in to get it fired up. This ain't EFI. Quote Link to comment
raggmann Posted July 2, 2015 Author Report Share Posted July 2, 2015 Lol, thanks Mike. Yeah, if I give it throttle it gets worse. I poured a little gas down the throat of the carb and it tried to run. I'm kinda suspecting fuel pump maybe not putting out enuf. If it makes a difference I'm using the 521 L16 carb on the L18 Quote Link to comment
raggmann Posted July 2, 2015 Author Report Share Posted July 2, 2015 Update !!!!!!!!!! Been up too long. Had it set as cw rotation distributor not ccw. Yup, feel like a TOTAL looser Thanks guys 1 Quote Link to comment
datzenmike Posted July 2, 2015 Report Share Posted July 2, 2015 Just look at the front of the carb. If the window is full it's getting enough. Use the L18 carb. It has a larger primary jet Quote Link to comment
raggmann Posted July 2, 2015 Author Report Share Posted July 2, 2015 Too much junk on that L18 Can it be stripped down ?? Quote Link to comment
raggmann Posted July 3, 2015 Author Report Share Posted July 3, 2015 Thanks for the help guys. Got it to run finally tonight. Need to figure out a gas tank and get the exhaust built and it should be ready to see the light of day. http://img.photobucket.com/albums/v294/raggmann/th_IMG_3416_zps38438f55.mp4 1 Quote Link to comment
Doctor510 Posted July 3, 2015 Report Share Posted July 3, 2015 Too much junk on that L18 Can it be stripped down ?? Why? Quote Link to comment
datzenmike Posted July 3, 2015 Report Share Posted July 3, 2015 Get it running. There are virtually no emissions equipment on the L18s. Don't mess with it and add a problem. 1 Quote Link to comment
raggmann Posted July 3, 2015 Author Report Share Posted July 3, 2015 The carb off the L18 is covered in junk. Hoses, wires, crap all over. Looks way more confusing that the one off the 1.6 I'll just wait till I've got the peso's to get a Weber. Or SU, or Delardo, or ?? Quote Link to comment
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