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"Swamp thing" JBC 510 racecar


Icehouse

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Can we actually say the motor is "in" the car at this point?

 

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Is Sam sporting a fan belt necklace?  Could be a big seller at Canby this year.

 

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It's official.  The motor is IN!!!!

 

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Not bad for an evening's work but we still have a few things to do in the next 4 weeks

 

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Jeff says "Nothin' to it but to do it" TM

 

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Thanks q-tip.  We'll keep that in mind.

 

Before getting together to work on the new motor install, we wanted to know what really happened to the L20b.

 

large.5af264af191b1_05052018swampthing(5

 

First interesting find was a broken clutch disk.  Maybe this is one of the reasons it started getting difficult to shift?

 

large.5af264a548a6c_05052018swampthing(1

 

The inner spring and a chunk of the retainer were wedged in the outer perimeter of the cover plate assembly

 

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That's not good...

 

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The tranny plate had a very curious swirly...  Was our brand new rear main seal leaking?  The bellhousing was an absolute mess!  Oil everywhere.

 

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Next discovery was a broken drive gear on the crank snout and a matching broken distributor drive.  Best guess is that the oil pump sucked up some shrapnel and stopped turning.  Like right now!  Probably *after* the engine let go.

 

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And now the real fun...  L20b lost and found.

 

See anything you recognize?

 

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Best guess is that one of the nuts backed off the rod cap.  This allowed bolt to dislodge and the crank to beat the crap out of the cap and slowly open it up and bend it 'till the other bolt broke.  At that point the rod and piston were disconnected from the spinning crank which proceeded to crush the piston like a blender before eventually bending the rod over and shoving it out the side of the block.  Good times!

 

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Look at the counterweight on that crank!

 

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I also found that the oil pickup was missing a bolt.  I don't think this led to the issue.  I think it was a result of the massive vibration while the crank and rod and piston were wrestling with each other a few inches away.

 

large.5af264cd94571_05052018swampthing(1

 

Poor little crank journal.

 

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Put your crank rod in, put your crank rod out, put your crank rod in, and you shake it all about...

 

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Thanks.

Looks like we will be using a sandwich adapter so the oil filter will be relocated - but only about 1"  (sorry Jeff, about 24mm)

 

Here are some shots from Wednesday.

 

Gas tank pulled and drained and cleaned (again)

 

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Shifter hole enlarged and B&M short shifter (not pictured) installed.

 

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Accusump installation started:

 

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Radiator installed and wiring started

 

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Front suspension reinstalled

 

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Still a lot to do.  Next race is only 4 weeks away?

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I was still curious about the L20b failure so I sifted through the oil pan shrapnel collection. 

 

I found the missing oil pick-up bolt.  It was BROKEN!

 

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Judging from the gouge in the side of the tube, the piston rod took a whack at it, snapping the mounting bolt in the process!

 

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I also confirmed that the oil pump is seized - likely from solid aluminum induction.

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Thanks.

Looks like we will be using a sandwich adapter so the oil filter will be relocated - but only about 1"  (sorry Jeff, about 24mm)

 

Here are some shots from Wednesday.

 

 

large.5af7a3e3ca698_05092018swampthing(6

 

Front suspension reinstalled

 

large.5af7a3e6e8310_05092018swampthing(7

 

 

 

that 1 inch should help. these are about the poses i have to make to get mine out except down on my knees to allow for better leverage

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I was still curious about the L20b failure so I sifted through the oil pan shrapnel collection. 

 

I found the missing oil pick-up bolt.  It was BROKEN!

 

large.5af7a3f1cd503_05122018swampthing(1

 

Judging from the gouge in the side of the tube, the piston rod took a whack at it, snapping the mounting bolt in the process!

 

large.5af7a3f4793d5_05122018swampthing(2

 

I also confirmed that the oil pump is seized - likely from solid aluminum induction.

 

 

Annihilated is a good word for the day. 

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Installed a Freddy.

IMG_7881.jpg

 

Shortened driveline installed.
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Jeff had a great starter chunk for the down pipe.
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It didn't get us to the ideal location under the car but cleared the steering intermediate shaft nicely :-)

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Large items left, fuel lines/surge tank and oil lines, throttle cable, and wiring... 2 weeks.

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  • 2 weeks later...

Only took one picture from WOT Wednesday.  We all worked hard but seemed to have little to show for our efforts.  Here is Sam making the twin pump fuel delivery system:

 

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The race is in one week so we needed to step it up a little.  We spent this morning together working on the car.  Jeff said we need to modify the gas pedal for the throttle cable.  I asked what the plan was, he said cut here weld there etc.  I looked at both gas pedal set ups and realized it looked like the stock 510 pivot would slip on and replace the pivot from the modern pedal.  Sure enough, same diameter, same measurement to the e-clip.  I just swapped over the pivot and done!  The throttle cable was a little too long though so I made a cable clamp for it to shorten it up - works like a charm!

 

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Next step was to cover the shifter hole.  The 620 cover is too wide and flat for the 510 but a little work in the vice sorted that right out.

 

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The cover was a bit rusty so I painted it with some white Zero Rust.  While I had the can out and a wet brush, I decided to take care of something I had intended to do when I first painted the black 71 on the roof.  Improve its contrast with the base colors...

 

A little careful masking, a little careful painting:

 

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Ta-da!

 

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Jeff was being camera shy but spent most of the morning working on wiring.  Here he is powering up the fuel pumps.

 

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Sam was being camera shy as well but spent the morning finishing the fuel line plumbing.

 

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Does this look "race car" enough?!

 

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Loaded the sump with oil, turned the "key" and after 2-3 cranks, it fired right up and purred like a kitten!

 

http://datsun510.com/uploads/monthly_2018_05/5b0a12f64b1a5_05262018swampthing.MOV.f1e6d7c850f538110fcb2f867749769a.MOV

 

The list is getting shorter but so is the number of days before the race!

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  • Icehouse changed the title to "Swamp thing" JBC 510 racecar

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