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Old 03-21-2019, 05:54 AM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
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Water pump o-ring part number is 035121043. Available online for under $2 or the dimensions are 98mm x 4mm if you want to find one off the shelf.

I suggest using a new O-ring and don't consider RTV here. You will need to move the pump multiple times as you adjust the pump's position when setting timing belt tension, disturbing the sealant. It's also a hassle to clean up the next time you are there.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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