Many, many MF135’s are now in need of an engine rebuild, as most of these engines have now clocked up between 6,000 and 15,000 hours – some even more! In our experience there is no point in only half-doing an engine. If you are going to go to all the trouble of a complete engine strip-down then it makes sense to replace all of the worn components.
The most economical way to do this is to buy a full engine kitwhich will include everything you need.
The Perkins AD3.152 engine was fitted to the 135, 148 and 240 tractors and kits contain pistons, rings, all gaskets, valves kit, liners, big small and main bearings, oil pump assembly, etc.
If you are looking for some guidance on how to asess an engine for wear and serviceabliity, then the MF35 Engine Rebuild DVD is useful – with a trailer video and photos of the engine rebuild.
Care and attention is probably the most important thing when doing a full rebuild. You may need to label lots if different containers with the nuts and bolts that belong to a certain component. If you lay them all out in the order you dismantled then the rebuild process will be much easier. Another tip is to take photographs as you go along to remind yourself of what goes where.
When assessing all the components it is vital to take your time. You will need some feeler gauges, a vernier, micrometers (of different sizes) and preferably a dial test indicator to measure the liner standout above the top of the block.
The 3 cylinder AD3.152 developed 45.5Hp from a 3.6″ (91.4mm) bore and 5″ (127mm) stroke. The engine is probably the major factor that made the 135 such a great tractor and we can all recoginse the sound of a MF135 as it trips along the road, down a farm track or is working in the field. Music to my ears if the engine is in good condition.