Leaking cylinder head plug - ZR-1 Net Registry Forums

AndrewL · 01-23-2022

Hey guys

I'm going through my new to me 91 ZR-1 and going over it to make sure everything is okay and cleaning it up to my standard.

I've noticed oil slowly leaking from the plugs pictured at the back of the cylinder heads.

The service manual doesn't seem to go into enough detail to confirm that the pictured plug is the lifter gallery plug, and if so what the torque value to reinstall it is.

Am I right in thinking the pictured plug is the lifter gallery plug?

Anything I need to be mindful of if I'm looking at removing them so I can reinstall them and reseal them with Loctite 565?

Jagdpanzer · 01-23-2022

These are tapered pipe plugs and can be difficult to remove. Suggest resealing only the ones that are leaking.

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Jagdpanzer · 01-23-2022

They are for plugging the ends of the drilled oil galleries that feeds oil to the lifters and and cam bearings.

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XfireZ51 · 01-23-2022

Have same issue. Same drip has been there for years. I don?t see spots on the vround or smell burning oil,

AndrewL · 01-24-2022

Thanks guys, much appreciated. Based on the feedback received and the fact I'm likely to pull the engine within the next year I'll monitor it and if not leaking too badly I'll leave it until the motor comes out.

01-23-2022	#2
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,661	Re: Leaking cylinder head plug These are tapered pipe plugs and can be difficult to remove. Suggest resealing only the ones that are leaking. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

01-23-2022	#3
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,661	Re: Leaking cylinder head plug They are for plugging the ends of the drilled oil galleries that feeds oil to the lifters and and cam bearings. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

01-23-2022	#4
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Leaking cylinder head plug Have same issue. Same drip has been there for years. I don?t see spots on the vround or smell burning oil, __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

01-24-2022	#5
AndrewL Join Date: Dec 2020 Location: Sydney, Australia Posts: 86	Re: Leaking cylinder head plug Thanks guys, much appreciated. Based on the feedback received and the fact I'm likely to pull the engine within the next year I'll monitor it and if not leaking too badly I'll leave it until the motor comes out.