Replace BMW Airhead Twin Pushrod Tube Seals

Reader Contribution by Mc Staff
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Introduced in 1969 for the 1970 model year, BMW’s “Slash 5” line of air-cooled twins was the Bavarian maker’s most successful new offering to date. Well made and incredibly durable, the /5 and subsequent /6 and /7 models in all their various guises were built in record numbers, with almost a quarter million churned out from the BMW factory between 1969 and 1980.

Today, more than 40 years after the series’ introduction, there are still tens of thousands of these venerable “airheads” plying the roads. Legendary for their ability to run forever, they are rolling testimony to BMW’s excellent design. But good as they are, they’re not immune to the sort of common problems that can afflict just about any machine. Eventually, any motorcycle that’s used will develop leaks of one sort or another at critical sealing points, and with these BMWs the pushrod tube seals — the focus of this How-To — are a common leak area.

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