Retro Tech & Electronics | Delorean Maintenance - Fluids flush OIL/COOLANT/BRAKES - Plus Gas Piston Swap and Comparison @retrotechandelectronics | Uploaded February 2019 | Updated October 2024, 7 hours ago.
***This is a recorrected re-release video to address footage of the hood and engine compartment struts being installed backwards. ***
I team up with Elvis for another Delorean tech day. The theme of which is fluid flushes. This began with a simple swap-out of a door piston that had gone weak, however given the performance of the new one, I decided to order a complete set from Special-T-Auto and do a side-by-side comparison at the end of the video.
Once arriving at the shop, with the car on the lift, the project begins with the oil drain and filter removal. With that underway, a strategy is used to remove MOST of the coolant without going crazy. Subsequently closing the system and loading it with demineralized water.
Of course its important at this point to complete the oil change procedure with a filter and new oil!!! Running the car with a full heat cycle and allowing to sit for a while. It is then re-drained and resealed, but not before each mating surface is controlled and cleaned to ensure no leaks are visible upon refill with 50/50.
The next full run monitors temperature and heat control. It was found also that the fan sensor switch needed a cleaning for good operation. With this, it was onward to the Brakes.
The brakes were started with the evacuation and cleaning of the reservoir with the vacuum pump, and filled with fresh oil. This pump, also used for pulling oil to the calipers as it it slowly filled to clear the pipes. Pulling open the calipers and pushing the pedal in the conventional method is also used to ensure the fluid is removed from the outer caliper.
As the car is brought back to the house the swap-out of the gas pistons begins. With immediate noted positive performance. The most interesting however is the side by side comparison of the DMC shock as compared to the one from SPECIAL-T-AUTO, the later of which slows at it approaches the top of the travel and doesn't rip the door off the hinges.
***This is a recorrected re-release video to address footage of the hood and engine compartment struts being installed backwards. ***
I team up with Elvis for another Delorean tech day. The theme of which is fluid flushes. This began with a simple swap-out of a door piston that had gone weak, however given the performance of the new one, I decided to order a complete set from Special-T-Auto and do a side-by-side comparison at the end of the video.
Once arriving at the shop, with the car on the lift, the project begins with the oil drain and filter removal. With that underway, a strategy is used to remove MOST of the coolant without going crazy. Subsequently closing the system and loading it with demineralized water.
Of course its important at this point to complete the oil change procedure with a filter and new oil!!! Running the car with a full heat cycle and allowing to sit for a while. It is then re-drained and resealed, but not before each mating surface is controlled and cleaned to ensure no leaks are visible upon refill with 50/50.
The next full run monitors temperature and heat control. It was found also that the fan sensor switch needed a cleaning for good operation. With this, it was onward to the Brakes.
The brakes were started with the evacuation and cleaning of the reservoir with the vacuum pump, and filled with fresh oil. This pump, also used for pulling oil to the calipers as it it slowly filled to clear the pipes. Pulling open the calipers and pushing the pedal in the conventional method is also used to ensure the fluid is removed from the outer caliper.
As the car is brought back to the house the swap-out of the gas pistons begins. With immediate noted positive performance. The most interesting however is the side by side comparison of the DMC shock as compared to the one from SPECIAL-T-AUTO, the later of which slows at it approaches the top of the travel and doesn't rip the door off the hinges.
![Sears Silvertone Twin Twelve 1484 Major Restoration Project [3/6]](https://i.ytimg.com/vi/SAU2KmtoJUQ/hqdefault.jpg "Sears Silvertone Twin Twelve 1484 Major Restoration Project [3/6]
Here in part 3 we continue with preparation with turn-up by installing the pot needed for the hum balance which replaces the filament center tap. After this a dry run without tubes is conducted just to be sure everything is ok. If the tap cant meet 6.3 without tubes it cant be the right tap and i have to switch to the next one. Given the one at around 7 volts its time to add the tubes to the amp.
With all of the tubes in the amp we come to find that the final filament voltage is 5.9. It looks like another turn or two will be needed out of that transformer. A retest with 2.5 wraps shows 6.2 volts at 120vac.
Following this The temperature gun will be used to measure the heat off of the transformer after 30 minutes or so. No heat issues were found. To celebrate, the transformer covers were stripped and painted, as well as the rewiring of the reverb tank.
I break out the impedance bridge to test the cabinet and confirm the impedance at 8 ohms.
I found an extra speaker jack that was inappropriately added to this cabinet that I could remove to place the hum pot into. After that, its time for the first full smoke test.
I wish this amp had an adjustable bias..... also I discover at this time that the standby circuit is garbage. I end up having to use several tubes from Cornerstone music to find something that operates within safe parameters.
This brings the project into the noise isolation phase. and there is no shortage of noise in this amp; all sorts of different types of noise from different stages.
This starts from the finals backwards to the phase inverters. Where things are already looking strange.
#retrotechandelectronics #vintagetubeamprepairs")
