Re: packard 1936 standard 8 1402 engine problems

Posted by Owen_Dyneto On 2014/4/3 0:19:34

I'm reasonably familiar with that engine, it's essentially the same as the 320 engine in my 34 with the exception of having insert rod bearings. Sounds like you've got the rods and pistons assembled correctly; the squirt holes in the rod big end should face the "thrust" face of the bores (camshaft side of the engine). Ditto for the slot in the piston though Packard earlier on had them the other way, changed to the cam side and said it wasn't all that critical. This is mentioned in the early Service Letters.

Which valves are giving trouble, intake or exhaust? The exhaust valves essentially run with no lubrication and the intakes only get lubrication when manifold vacuum can draw mist up the guide/stem during the intake stroke. If you remove the valve covers, is the area dry or oily? Your problem sounds to me like the valve stem-to-guide clearances were not set to specification. Did you check the guide clearance and ream if required? A bit of a long shot might be too much clearance on the lifter bores which can give a lateral or side thrust to the valve stem, making stem wear more rapid.

BTW, that model is an Eight, not a Standard Eight - the Standard designation for that engine was dropped after 1932.

PS - here's some excerpts from Packard Service Letters about the big end bleed holes and the piston expansion slot.

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