My client has a hyster s80xlbc2s with the gm 4.3 vortec V6. It has a bad oil leak which is most likely caused by a bad rear main seal. Does the engine have to be pulled out of the chassis to replace this seal? Does any one know of any tricks or short cuts to make this job easier? This particular client does a lot of repairs him-self, but he is probably going to want me to do this one, what is a realistic labor time estamate for a job like this? (this job must be done on location, but the location has everything needed for this type of work). Thanks.