Well anyone who knows about The Gardner Engines ,they had no gaskets on the rocker covers or the side plates, We had two Fodens with 150s in them & they did leak at one point but we removed them & coated them with a type of sealing paste, I cant recall the name but we used to get it from Commercial Truck Services at Faverdale when they were Foden dealers, & it worked a treat our problem solved, Great engines in my opinion, Regards Larry