C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

How to not ruin new Optispark

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Old Apr 20, 2025 | 11:12 PM
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Default How to not ruin new Optispark

Have take my lt4 apart due to a leak at the crank seal. Is there a way to not let coolant fall on my new petris opti?
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Old Apr 20, 2025 | 11:52 PM
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Originally Posted by 1993C4LT1
Have take my lt4 apart due to a leak at the crank seal. Is there a way to not let coolant fall on my new petris opti?
There's no water running through the intake so you wont get a big flood. Just make sure you really get the coolant level below the water pump as best as you can.
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Old Apr 21, 2025 | 12:36 AM
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I had to do exactly this repair. I removed both knock sensors and drained the block into a mortar mixing tub from Home Depot. Because draining the block doesn't drain the cold-side radiator hose, I also drained the radiator at its drain ****. Not a drop on the 1 year old Petris because the block was completely drained, and the hose was drained too. I was able to reuse the drained coolant.
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Old Apr 21, 2025 | 02:22 PM
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drain from knock sensors. No coolant in block = no coolant on Opti. Then a fresh fill of new coolant and you should be good come next winter.
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Old Apr 21, 2025 | 02:53 PM
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Even easier than the knocks is to blow the coolant out of the block with a shop vac. Dan
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Old Apr 21, 2025 | 07:13 PM
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Thanks guys
I just was very careful with the coolant. Put a million towels. When I removed the hoses, I had a small funnel ready to catch the coolant.

Now, question is, do I spend the money on a dewitts.
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Old Apr 22, 2025 | 02:17 PM
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Even easier method which I used several times was to drain the coolant from the radiator. Remove the thermostat, and take a shop vac and place it into the thermostat opening and suck every bit of coolant out of the engine that you can get. You can then remove the pump without and coolant leaking, and clean up is just emptying the shop vac tank.
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Old Apr 22, 2025 | 02:37 PM
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Originally Posted by Yonker
Even easier method which I used several times was to drain the coolant from the radiator. Remove the thermostat, and take a shop vac and place it into the thermostat opening and suck every bit of coolant out of the engine that you can get. You can then remove the pump without and coolant leaking, and clean up is just emptying the shop vac tank.
It is easier to blow it out the radiator drain than clean up a shop vac. Best to remove bottom radiator hose. Blowing will get more than sucking. Dan
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