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1978, 620 King Cab, Rebuild


Scoobs

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Picture heavy post here :D Got it mostly tore down, never tore into a nissan/datsun engine, but im noticing stampings on the pistons and block/head mating surface, pistons are marked as follows, Block stampings are 3,3,3,4 and the pistons are u2 3, u2 3, u2 3, and u3 4. Cylinder walls look decent, only on 3 i see a distinct oil ring stain from sitting, and cyl 1 and 4 show a very very light low spot. 

 

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So I checked my clearance on my rings... my service manual says .0009-.0157. My actual gap is .039-.042. Looks like somebody was in there and did a half ass job. Now to find pistons and rings that will correct that issue.

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It doesn't come from the factory like that, someone has 're-built' it in the past. #3 is loosing oil. Measure the bore width it may have been over sized or it may be oval, or tapered. Best would be to over bore to the next over size piston and replace them.

 

It will cost the same to rebuild an L18 as an L20B and it makes about 10 less hp and torque. Stick with the L20B.

 

Yes everything will swap to the L18 but the clutch and flywheel, and the exhaust manifold.... again stick with what you have. I had my Z22 block over bored for only $25 per hole.

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Block and head are at the machine shop. Dropped them off on Thursday. Should hear back in a week or 2. In the meantime I rebuilt the Hitachi Carb and got the new water pump. Is there a way to get the fan clutch part off the water pumps?

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Head to the junkyard and find an early Z car without a fan clutch. Buy the fan and the pulley. Then pick up a new water pump for an early Z car. You have now successfully removed your crappy fan clutch   :)

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You can cut the fan off. Just stay away from the pulley it's also pressed on and will come off if you cut beside it. Unscrew the clutch fan and remove the front cover, drain the oil and use an angle grinder with a cut off blade to score the aluminum and pull apart. Trim the bearing off.

 

 

 

 

 

 

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I want to put an electric fan on it instead of a clutch fan. But the fans i have wont fit due to trans cooler, and the clutch.

 

Volvo fan fit's in front, this is the same orientation that the Volvo uses.

 

 

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You can just unbolt the fan from the clutch and leave the clutch on the water pump.

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Engine is still at the machine shop, the head is ready for pickup, and they just got the block cleaned last night, today they are measuring the bores to see where we stand on rings/pistons. I took some photos of why i cant mount the fan in the front of the radiator like some have said, there is an aftermarket? transmission cooler held on with wire that sits right in front of my radiator.... Id like that to go away, maybe find a radiator that has the trans cooler built in. 10524738_10202522199683169_8703244810694

 

 

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Ok, i now have all the parts to put it together, i have it sitting here back on the stand, just finished the freeze plugs and i set the crank in, now on the rear main seal, it has the regular oil seal, and the bearing cap has these groves on each side for the rubber inserts with the metal "shims" Does anyone have any information on how those go in there? Thats where im stopping till i figure that out, since my chiltons manual is dumb and just says how to install the big seal.... 

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