When idling if you can hook a hose to the breather and blow leaves like a shop vac - that's too much blowby...
If idling for 5 minutes and it leaves an oil ring on the ground 10 inches around - that's too much blowby...
Our 1256 would leave an oil spot about the size of a silver dollar in 10 minutes of idling. Started OK, but not great. Still running for the next guy.
Neighbor had a 3688 would leave an oil slick in about 5 minutes, but started just fine so he kept running it.
Hard starting can be caused by a few things:
1. low compression
2. bad injectors
3. low injection pressure (bad pump)
4. incorrect timing of the injector pump
5. poor quality fuel
6. low temps
I can't say I've ever seen our 1086 blow white smoke at start up... Depending on how long and hard you run it before shutting it down, the white smoke could be condensation (water) in the cylinders just burning off. Or it could be a slight coolant leak.
Personally, for determining an overhaul, I would not use blowby. Low oil pressure, high oil consumption, and low compression would be reasons to overhaul. Compression check isn't all that difficult.
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