]2eDeYe Posted January 18, 2017 Report Share Posted January 18, 2017 Looks good even on a dolly. :cool: What was the cooling issue? Quote Link to comment
flatcat19 Posted January 18, 2017 Report Share Posted January 18, 2017 Cooling issue? Isn't it already 20° outside over there? Quote Link to comment
Ron1200 Posted January 19, 2017 Author Report Share Posted January 19, 2017 Yeah It was cold... Started the day driving the 620 to a family event about 6 miles out Lincoln Creek Rd from Galvin. For those not familiar with this area, It's one of my favorite motorcycle roads full of curves and whoops. At Galvin I happened upon two slammed Civics. We had fun, with for me, lots of 3rd gear full throttle opportunities. Just pointing out - I had no issues with heat. On the way back to the freeway several hours later, while at a stoplight, the engine bay erupted with a cloud of steam dense enough that I couldn't see forward. I limped it to my mom's house which was about a mile away. After getting the 620 home and replacing the lost coolant, I've discovered there are no broken hoses or other obvious leaks. There is no oil in the coolant. I see no bubbles at the top of the radiator with the cap off. What I can see is lots of rusty coolant. Earlier in this build thread (Oct '14), I had similar issues caused by sludge blocking the coolant passages in the L20b. I'm guessing that some leftover sludge dislodged with my multiple 'full throttle' blasts earlier. I put in a new radiator, water pump, thermostat and hoses within the last two years. (doesn't seem that long ago). So I'm assuming that the parts are good and major flush is in order. My plan of action: 1. Add some Prestone radiator flush, let it circulate for 20 mins and then set overnight. 2. Remove the hoses and reverse flush the radiator. 3. Remove the thermostat and flush the block. 4. Reattach everything & fill with water and let it circulate for 20 mins, check for leaks and drain. 5. Refill with Dex-cool. Hopefully I'm not dealing with a blown head-gasket. 2 Quote Link to comment
]2eDeYe Posted January 19, 2017 Report Share Posted January 19, 2017 Hopefully your new cap just released all the pressure. Did the motor ever show as hot? Quote Link to comment
tdaaj Posted January 19, 2017 Report Share Posted January 19, 2017 We need to do another Lincoln Creek cruise. We Olympia guys did one couple year back and it was a blast. 1 Quote Link to comment
Ron1200 Posted January 20, 2017 Author Report Share Posted January 20, 2017 Hopefully your new cap just released all the pressure. Did the motor ever show as hot? It reached the highest section of the normal range on the stock gauge. But if the sender is not submerged in coolant, how accurate is the gauge? We need to do another Lincoln Creek cruise. We Olympia guys did one couple year back and it was a blast. I'm down with this :thumbup: Quote Link to comment
]2eDeYe Posted January 20, 2017 Report Share Posted January 20, 2017 I think as long as it stays below the upper line you are ok. 1 Quote Link to comment
Ron1200 Posted January 20, 2017 Author Report Share Posted January 20, 2017 I'll be working on it this weekend.... fingers crossed :unsure: 1 Quote Link to comment
flatcat19 Posted January 21, 2017 Report Share Posted January 21, 2017 Where you describe on the gauge is really only about 190°. 2 Quote Link to comment
Ron1200 Posted January 23, 2017 Author Report Share Posted January 23, 2017 (edited) Cleaned both the radiator and block. I searched the interwebs and found info on using an air compressor to augment the flushing of the cooling system. It worked very well. REVERSE FLUSH PROCEDURE "If you have an air compressor available, position an air blow gun between the garden hose and the rag and squeeze the handle on the tool to force compressed air behind the water to give it a high pressure flush. Please note that the flush water flowing out of the coolant hose will be blasting out like a high pressured fire hose. Nothing will flush a cooling system better than this method, however be aware that it is very messy and you will probably get wet." I might be dealing with a sketchy thermostat. While circulating the water & flush mix, I noticed a quick rise in temp and then the thermostat opened and the water temp dropped below normal. It did this a couple of times. The large temp swing is not normal. Typically once up to temp it stays steady. I'm thinking that I'll replace the thermostat and radiator cap. Parts arrive Wednesday. Edited September 20, 2018 by Ron1200 3 Quote Link to comment
Ron1200 Posted February 1, 2017 Author Report Share Posted February 1, 2017 Cooling system fixed... Damn brake master cylinder went out... More parts on the way :hmm: 3 Quote Link to comment
Ron1200 Posted July 24, 2017 Author Report Share Posted July 24, 2017 So spent my Sunday fixing the photos in this thread due to the Photobucket F-up. Will add that I changed out the brake master cylinder and after some initial bleeding issues, all is working well now. I went with this one from Rockauto for $36 (no core needed). CARDONE SELECT 131839 1 Quote Link to comment
Ron1200 Posted August 28, 2017 Author Report Share Posted August 28, 2017 Finally got the 720 4x4 springs installed on the back of the 620 this weekend. The ride is 110% better... No more bouncy-bouncy - Just a well controlled ride. It rides like a car. Even took wifey for a ride and she gave it a thumbs up. And as a bonus, both sides measure the same the distance from the ground to the bottom of the wheel arch at the center-line of the rear wheel. With mono springs, 3" lowering block and no air in the air-shocks: DS 24 7/8" PS 24 5/16" With 720 4x4 springs, 3" lowering block and no air in the air-shocks: DS 24 5/8" (+3/16") PS 24 5/8" (+5/16") Nothing seems to happen on the my 620 without 'issues'... Turns out that one of the 4x4 springs I got from the wrecking yard was tweaked. I didn't notice this until I removed the shackles. So took them to Right Way Springs in Tacoma for repair. On their recommendation (I don't know shit about springs) they removed the over-load leaf with the funky weight on the end of it. Re-arched springs (freshly painted) and new bushings Old mono leaf spring New 720 4x4 springs This thing drives, rides and looks so much better than when I got it. No hate at the original owner, I bought it with the understanding that it was a 'project'. 3 Quote Link to comment
]2eDeYe Posted August 28, 2017 Report Share Posted August 28, 2017 Aren't they all lol What size is that master cylinder? 1 Quote Link to comment
Ron1200 Posted August 30, 2017 Author Report Share Posted August 30, 2017 Yeah my life is projects, projects, projects right now... :) The master cylinder is 13/16. 1 Quote Link to comment
Ron1200 Posted July 31, 2018 Author Report Share Posted July 31, 2018 (edited) I've been negligent the updates... Brakes: I finally exorcised the brake vibration. First I installed new front rotors, but it had minimal effect. Then Installed new rear brake drums to replace the old drums that I had turned. That was it. Whoever turned the drums did a crappy job. Really! I had them turned at Cut Rate Auto Parts (CRAP) :) Wheel Bearings: Decided to replace the front wheel bearings as part of the front rotor replacement. After inspecting them they were in great shape, so didn't replace 'em. Popped in new seals and reinstalled them. Tie Rod: The passenger side tie rod's end play was about .25-inch. It wasn't to bad where I mostly drive (< 40 MPH). However it was a chore to keep in my lane at freeway speeds. After the Tie rod was installed, I took it in for an alignment. All is good now. I still need to pull the steering wheel and clock it one spline to realign the wheel to the direction of travel (easy-peasy). Edited July 31, 2018 by Ron1200 Add Pics 3 Quote Link to comment
tdaaj Posted July 31, 2018 Report Share Posted July 31, 2018 Nice to see you are still around 2 Quote Link to comment
Charlie69 Posted July 31, 2018 Report Share Posted July 31, 2018 Ron it is good to see you doing maintenace to you 620 king cab. This tells me two things, first your love of Datsuns is still going strong, and second your truck is still on the road. This is great! I am getting a vibration when I brake and I an also experiencing brake drag on my 86 720 king cab. I replaced rear wheel cylinders for the brake drag. This did not help. Next I will replace shoes and drums. 1 Quote Link to comment
]2eDeYe Posted July 31, 2018 Report Share Posted July 31, 2018 Nothing like fixing a vibration. Is that bumper a new addition or did I miss it somewhere in the thread? 1 Quote Link to comment
Ron1200 Posted July 31, 2018 Author Report Share Posted July 31, 2018 (edited) I also replaced my Ignition Control Module (Standard Motor Products LX516) - Temporarily with diet coke - Permanently with a new module (read about it here) Ted: Yup still around... Hey was that a crack about my weight? :) Charlie: New drums weren't to pricey. About $18 each from Rockauto. Steve: I made it a while ago out of 1x3 rectangular tube. JRock's shop did the the powder coating of it and the turn/brake light surrounds in Near Chrome to match. Edited July 31, 2018 by Ron1200 Add pic 2 Quote Link to comment
]2eDeYe Posted July 31, 2018 Report Share Posted July 31, 2018 Ha, I even liked the posts. Damn CRS.... 2 Quote Link to comment
Ron1200 Posted September 17, 2018 Author Report Share Posted September 17, 2018 (edited) The 620 "The Skyline of Trucks" was sold... It is going Vallejo, California. Hopefully the new owner will show up here. photo copied from 79kingcab who copied from Sam Barer Edited April 3 by Ron1200 add photo 2 Quote Link to comment
Charlie69 Posted September 18, 2018 Report Share Posted September 18, 2018 (edited) The drum On 7/31/2018 at 1:23 PM, Ron1200 said: I also replaced my Ignition Control Module (Standard Motor Products LX516) - Temporarily with diet coke - Permanently with a new module (read about it here) Ted: Yup still around... Hey was that a crack about my weight? ? Charlie: New drums weren't to pricey. About $18 each from Rockauto. Steve: I made it a while ago out of 1x3 rectangular tube. JRock's shop did the the powder coating of it and the turn/brake light surrounds in Near Chrome to match. The drums and the shoes were Wagner from Rock Auto. I am trying Centric next. Who knows maybe the drums were dropped somewhere in there travels. Remember when you would arc the shoes to the drums. Edited February 23, 2020 by Charlie69 Quote Link to comment
Ron1200 Posted April 3 Author Report Share Posted April 3 Someone copied my color :) 1 Quote Link to comment
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