[gmc1970]

leaking oil from oil seal a lot , not over filling , oil coming from bottom of motor not pump any thing i am doing to cause this ,i have had two of these to do this.thanks for any help

 

[lunkhead]

I would check crankshaft end play and bearing clearance or side play, and then if ok replace the seal. Also are you using the proper weight of oil and a good quality brand. Also check crankcase venting.