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Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

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M-46 Overdrive Tools. The following are useful tools <strong>for</strong> manual transmission overdrive maintenance and<br />

rebuild tasks.<br />

1. Pressure Relief Valve Tool. [Duane Hoberg] Here is a tool I designed <strong>for</strong> removing the Pressure Relief<br />

Valve ( between numbers 22 and 23 on the diagram of the overdrive overhaul procedures.<br />

M-46 Overdrive Pressure<br />

Relief Valve Tool<br />

2. Top Nut Removal Wrench. [Randy<br />

Starkie] A cutoff 11mm box-end wrench/<br />

spanner is able to fit in the limited space<br />

to remove the top two nuts on the<br />

Laycock overdrive unit. See the photo to<br />

the right.<br />

Overdrive Spanners<br />

3. Pan Caps Removal Pin Spanner.<br />

[Randy Starkie] To the right is a pin<br />

spanner used to remove the caps under the pan on the Laycock unit. The 3/16" bolts are through a square tube<br />

positioned on 5/8" centers with the end of the bolts ground to a radius. This tool eliminates the common practice<br />

of using a punch/drift and a hammer to turn the caps.<br />

Engine Lift and Support. See the photo and plan<strong>for</strong>m <strong>for</strong> Dick Riess' and John Vilas' design <strong>for</strong> an engine lift<br />

and support, useful <strong>for</strong> changing motor mounts and oil pans. It is made of 2x6 lumber and mounts on the<br />

fender channels.<br />

Engine Lift Photo<br />

Engine Lift Plan<br />

[Art Benstein] Another version uses two-inch rectangular metal channel stock as the support.<br />

Lift Using Metal Channel<br />

Stock<br />

Note the use of the hook and nut. Get a hook with threads long enough to take up<br />

the engine sufficiently to remove engine mounts.

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