Replacing freeze plugs on 240Z

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L320-Dale
Posts: 188
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Location: North Gilbert

Replacing freeze plugs on 240Z

Post by L320-Dale » Fri Nov 20, 2020 11:40 am

I found a freeze plug on my Z car (70 240Z) that needs to be replaced. I think I will replace all of them that I can get to while the engine is still in the car. Of course I will need to remove the carbs, intake and exhaust to do that side of the block. Looking to make a list of parts to order so I have everything on hand before I start. Hoping I can do it all in one day without needing more parts. :lol: Any parts I'm missing or recommendations are appreciated.

1) Set of new freeze plugs
2) Intake/exhaust gasket
3) Carb base gaskets?
4) Exhaust manifold pipe gasket?

Thanks,
Dale
Dale - Gilbert, Az
1965 L320 - Bamboo Tan / 1972 1200 - Sun-light Blue / 1970 240Z - Silver

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cgsheen
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Joined: Sat May 25, 2019 11:34 am
Location: Mesa, AZ

Re: Replacing freeze plugs on 240Z

Post by cgsheen » Fri Nov 20, 2020 7:05 pm

On an L24 do you need to remove the carbs to get the intake manifold off?

My only suggestion is: don't do it with the engine in the car...
260Z - L28ET - MS3X ECU, Ford COP w/ Nissan Ignitor, diyautotune optical wheel - T04e .63 A/R, Intercooled - 310cc Injectors - Ultra Heaven Fuel Rail - 14point7 Spartan2 wideband - Coilovers - Big Brakes - 304 Gold Metallic! Sakura Garage, Phoenix AZ

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L320-Dale
Posts: 188
Joined: Thu May 23, 2019 6:25 pm
Location: North Gilbert

Re: Replacing freeze plugs on 240Z

Post by L320-Dale » Sat Nov 21, 2020 6:44 am

cgsheen wrote:
Fri Nov 20, 2020 7:05 pm
On an L24 do you need to remove the carbs to get the intake manifold off?

My only suggestion is: don't do it with the engine in the car...
Thanks Chuck, I value your opinion. Why not with engine in the car? Is it that hard to get to them? I was just thinking it would be easier than pulling the motor?

Thanks,
Dale
Dale - Gilbert, Az
1965 L320 - Bamboo Tan / 1972 1200 - Sun-light Blue / 1970 240Z - Silver

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cgsheen
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Location: Mesa, AZ

Re: Replacing freeze plugs on 240Z

Post by cgsheen » Sat Nov 21, 2020 2:28 pm

There's a plug in the back of the head. Are you certain of it's condition? I don't think it's possible to replace that one without pulling the engine. (In my mind, I'd hate to struggle with all the plugs on the side of the block with the engine in the car and later have the one I couldn't get to start leaking...)

Keep in mind that I've pulled engines UMPTEENTH times (as my mother would say). So, for me, it's become easier to have the engine out in the open for many things... (and I generally pull the engine and trans together and regret when I don't - including my latest engine only pull...) Everyone else's mileage may vary. This is a wildly personal judgement call I think, and each person is going to have different tool, skill, persistence, frustration, and physical limit thresholds. Best of luck with whatever you decide.
260Z - L28ET - MS3X ECU, Ford COP w/ Nissan Ignitor, diyautotune optical wheel - T04e .63 A/R, Intercooled - 310cc Injectors - Ultra Heaven Fuel Rail - 14point7 Spartan2 wideband - Coilovers - Big Brakes - 304 Gold Metallic! Sakura Garage, Phoenix AZ

AZhitman
Posts: 72
Joined: Sun May 26, 2019 8:05 pm

Re: Replacing freeze plugs on 240Z

Post by AZhitman » Thu Nov 26, 2020 6:01 pm

Agree with Chuck 100%. If one FP is bad, the rest are close behind.

If you're gonna pull it, re-seal the engine, replace FPs, inspect / replace water pump, check compression, inspect / replace coolant hoses and fuel lines... May as well clean and paint the block and pan while you're at it.

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L320-Dale
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Location: North Gilbert

Re: Replacing freeze plugs on 240Z

Post by L320-Dale » Thu Nov 26, 2020 6:35 pm

Thanks Chuck and Gregg. Sounds like that is the right way to go. I'll start ordering some parts. :)
Dale - Gilbert, Az
1965 L320 - Bamboo Tan / 1972 1200 - Sun-light Blue / 1970 240Z - Silver

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Randalla
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Location: North Scottsdale

Re: Replacing freeze plugs on 240Z

Post by Randalla » Thu Nov 26, 2020 9:14 pm

Dale, I've pulled many a Z engine and owe you for all your past help. Name the day and I'll be down to help do the job. Between the two of us we'll have the engine and trans out in an hour. If you don't have a cherry picker, I have one at my storage place.
1967 1/2 Roadster- 1600 4 cyl.
1972 240Z- 280 I-6
1975 280Z SCARAB- 350 V-8
1975 280Z - I-6
2003 350Z Track- VQ V-6
2005 Mazda Speed Miata- Turbo 4 cyl.

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L320-Dale
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Joined: Thu May 23, 2019 6:25 pm
Location: North Gilbert

Re: Replacing freeze plugs on 240Z

Post by L320-Dale » Fri Nov 27, 2020 6:45 am

Thanks for the offer Randy. Let me round up some parts.

Dale
Dale - Gilbert, Az
1965 L320 - Bamboo Tan / 1972 1200 - Sun-light Blue / 1970 240Z - Silver

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Turboman280
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Location: Mesa

Re: Replacing freeze plugs on 240Z

Post by Turboman280 » Fri Nov 27, 2020 3:14 pm

I have a set of freeze plug installation drivers if you need.
Carl
1975 280Z restomod
Work in progress

Doctor510
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Joined: Fri May 31, 2019 3:55 pm

Re: Replacing freeze plugs on 240Z

Post by Doctor510 » Mon Nov 30, 2020 6:44 am

Be sure to use BRASS freeze plugs. I f it were me, I'd remove the motor so the big plug in the back of the block can
be replaced as well. While the motor is out. it'll give you a chance to check the clutch an flywheel.

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