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Engine Block Cooling Jacket Flush |
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wight4031
AMC Apprentice Joined: Dec/13/2021 Location: Houston, Tx Status: Offline Points: 139 |
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Posted: Apr/24/2022 at 11:29am |
So, I'm replacing my intake manifold on my 304, going with an Edelbrock Performer, which requires draining the coolant. The block drain was fouled when I removed the plugs, had to punch through with a screwdriver.
Could use some advice:
Thanks. Robert |
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Robert
Houston, Tx 73 Commando Bullnose Truck Cab 304V8, T176, D300 |
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wight4031
AMC Apprentice Joined: Dec/13/2021 Location: Houston, Tx Status: Offline Points: 139 |
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So, an additional question.
What is this thing? It looks like some type of pressure relief valve/vacuum breaker. It came off the AMC 304 Intake Manifold, water side. There was nothing connected to it when I started disassembly, so I want to know if I need to reuse it, purchase a new one, or just install a pipe plug on the new intake manifold. |
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Robert
Houston, Tx 73 Commando Bullnose Truck Cab 304V8, T176, D300 |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6751 |
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That is a ported vacuum switch and was used to control EGR, fuel recovery canister ... depending on year. Doesn't seem that you are keeping things stock, so likely don't use it.
Cleaning the block in the vehicle with anything but a coolant flush can loosen some pretty big pieces of crud. If you take a frost plug out each side, I'd say use the vinegar soak and flush several times until clear. Likely needs more then on soaking if coolant has not had regular changes.
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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Use a commercial flush. Any of the other methods work great with a bare block but I'd be hesitant to try them on a fully assembled engine.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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wight4031
AMC Apprentice Joined: Dec/13/2021 Location: Houston, Tx Status: Offline Points: 139 |
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The PO had already converted a bunch...
Air Pump missing Stock exhaust manifolds gone, replaced with custom short pipes that come out just in front of the rear tires. 4-barrel Holley Carb on the 2-barrel intake manifold Dana 300 xfer case instead of the stock Dana 20 Tremec T176 4-speed trans instead of the T15 3-speed AMC model 20 rear axle instead of the stock Dana 44 The factory wagon cab is missing, but it has a truck cab instead and the factory seats are missing, it has bucket seats from a Wrangler... I've reverted back to only a 4-in lift, since the PO tried to do an axle over spring conversion.... I think I overpaid for this project vehicle, but it has kept me busy for the past 18 months. |
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Robert
Houston, Tx 73 Commando Bullnose Truck Cab 304V8, T176, D300 |
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wight4031
AMC Apprentice Joined: Dec/13/2021 Location: Houston, Tx Status: Offline Points: 139 |
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The PO must also have not known what that ported vacuum switch did, it was connected to the water side of the intake manifold, not the vacuum source.
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Robert
Houston, Tx 73 Commando Bullnose Truck Cab 304V8, T176, D300 |
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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Wow, could you post a picture of that? I have all kinds of visions dancing in my head!
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2713 |
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I think you are misunderstanding how the ported vacuum switch works. It DOES screw into the coolant side of the intake manifold. As the temperature of the coolant rises, the vacuum source is switched. Vacuum is sourced from the intake [full vacuum] AND from the carburetor [ported], and at operating temp the ported switch changes the source of the vacuum. Edited by Buzzman72 - Apr/24/2022 at 7:19pm |
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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wight4031
AMC Apprentice Joined: Dec/13/2021 Location: Houston, Tx Status: Offline Points: 139 |
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thank you, that helps.
Given the ERG and all was deleted by the PO, that vacuum port switch will be replaced by a brass plug. |
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Robert
Houston, Tx 73 Commando Bullnose Truck Cab 304V8, T176, D300 |
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Skwishy
AMC Apprentice Joined: Feb/01/2018 Location: Wisconsin Status: Offline Points: 208 |
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just a thought, hang on to it for some of the aussie or cali folks who still want emission compliance or keeping things original. im sure someone could make good use of that part
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HFD Helmet #33
'68 AMC Ambassador SST. always looking for parts and cool stories. In dire need of a manual trans. |
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