I measured the oil drain plug at 25 mm in diameter. None of my tool stores sells a 25 mm. The closest I can find is 1". What sockets/wrenches do you use?

I use a 1" box wrench. Got a nice long handle.
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George Downs, Bartlesville, Oklahoma, Central US

It's one inch. And I use a normal combination wrench.
They can be on pretty tight. New copper washers are available from FCP Groton or any Volvo dealer- you shouldn't have to overtighten it if you install a new washer.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 230K, 88 744GLE- 220K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 94 855GLT 189K

Hi. With an '87, you're in the wrong forum -- there's a "240" forum. But you're welcome to look around -- 140/164 cars in interesting, too, even if the engines (pushrod, rather than OHC) are a bit different.
Anyway, I've owned 164's and 240's, begining with 1973 and as late as 1993, and they all take a 1-inch socket.
Just be sure to observe your tightening torque, and always use a fresh copper washer!

Dunno for sure, but I bet 1" still applies. Volvo went (back to) metric with the 240 series, but left some of the routine maintenance stuff standard to keep us anti-metric folks happy.

Don't overtighten, and you can use a crescent wrench, though it ain't the best, it should work. Don't make it round.

You can get the copper warsher at about any parts store... bring your old one for comaparison.

-Matt


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-Matt '70 145s, '65 1800s, '66 122s wagon, others inc. '53 XK120 FHC