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Re: Rebuilding the Volvo MD7A, Part II
With regular oil changes for both engine and gearbox, the motor and gearbox can be very long-lived.
Remember to make all your gear-changes at idle and keep checking the gearbox oil level.
For years, my old gearbox held oil with no problem, then one afternoon the gearbox seal failed and the oil was plastered all over the engine room in a big line of oil splash. It sounded a bit clunky and I checked it.
Keep a final drive gearbox seal or two handy. They are about $6 (not from Volvo !!!). If i remember, it is a 100x120x12 mm seal (ID, OD and thickness).
If the seal leaks, when you fit the new one, knock it in a wee bit further than the old one, otherwise the new seal rides on the same wee rust pits as the previous one and leaks again.
In very cold weather, run a fan heater under the air filters to assist in the first start.
Be careful with scaling of the coolant entry ports in the head. They can scale up given time, then it overheats and scores the pistons. It will not happen in freshwater but can be a problem in the salty tropics.
I opened the removable side panels of the engine compartment so i could keep checking the engine. I run an open engine compartment. It's a bit noisy but I guess an older engine does need constant checking.
Last edited by Rockter; 03-30-2019 at 02:52 PM.