I have just dropped the Gearcase off my 1988 140 V4 to overhaul the Water pump and replace the Impeller whilst at the same time carrying out some routine maintenance on the Gearcase. On removing the Gearcase I noticed that the Water Tube was slightly damaged and crushed and just thought that I would replace the entire Tube on reinstallation. I have now brought the entire Lower Gearcase back home with me, some three hours drive from where the boat is housed to do the overhaul and after a little research have discovered what a large job replacing the Water tube is. I have decided that rather than pull the power head and replace the Water Tube I will machine up and adapter to fit over the cover and seal farther up the Water Tube past where the damage has occurred. My major problem is however as I thought I was going to replace the tube I did not note the size at all and now that I am ready to machine the adapter I have no idea what size to machine to and what size seals to install into my adapter. If there is anybody who knows the size of this Water Tube (outside diameter) if would be very much appreciated. Thanks very much in advance for any help. Regards Mike