Author	[Modern View]
Jeaux Bleaux 08-13-2012 21:40:50 12.26.249.205 Report to Moderator	Hi! I'm trying to repair a '51 8N and removed the head to replace the head gasket. I was probing the water jackets on top of the block and found two holes between cylinders 2 & 3 that are much larger than any of the other ports on top of the block. I stuck a wooden dowel about 7" down into this port and came out with about 4" of black oil and sludge on the end of the dowel. No sign of water in there (but I had already drained the radiator). So, is this supposed to be a water jacket area or is part of the crankcase cavity? I drained the oil as well and I can't imagine why there is still oil (4" deep) in this chamber area. All help much appreciated. Thanks! [Reply]   [No Email]
Jeaux Bleaux 08-15-2012 08:43:00 12.26.249.205 Report to Moderator	Re: Trying to identify ports in reply to Jeaux Bleaux, 08-13-2012 21:40:50   Thanks, Ken and John. I appreciate and value your advice. Ken, if I had any money, I'd just send the block to you for rebuilding... :) [Reply]  [No Email]
Ken(Ark) 08-14-2012 15:54:58 71.30.140.79 Report to Moderator	Re: Trying to identify ports in reply to Jeaux Bleaux, 08-13-2012 21:40:50   Quoting Removed, click Modern View to see If you just have extra money let me know and I'll send you my paypal number . If the oil pressure was Ok , I would clean most of the easy stuff and stick the head back on , then use it another 10 years . [Reply]  [No Email]
Jeaux Bleaux 08-14-2012 14:08:50 12.26.249.205 Report to Moderator	Re: Trying to identify ports in reply to Jeaux Bleaux, 08-13-2012 21:40:50   Thanks for the clarification, guys. Wow! 4" of standing oil/sludge in the bottom of that chamber. Guess I'll tear the entire engine down and clean it thoroughly. [Reply]  [No Email]
NOXJohn 08-14-2012 07:16:45 184.5.164.213 Report to Moderator	Re: Trying to identify ports in reply to Jeaux Bleaux, 08-13-2012 21:40:50   It is part of the water jacket. What you have found is 50-60 years of accumulated gunk. Clean out as best you can. Since you have the head off you may want to take it to a machine shop and have it cooked or boiled out. It most likely has a lot of gunk in it as well. They can also check to see if it is flat or shave it if necessary. [Reply]  [No Email]
Ken(Ark) 08-14-2012 06:05:50 71.30.140.79 Report to Moderator	Re: Trying to identify ports in reply to Jeaux Bleaux, 08-13-2012 21:40:50   The water pump is high on the front of the system and the outlet in the head is just above the pump which makes a short route for the water to circulate . The water jackets are very deep too. The N blocks collect debris and gunk very easily and are hard to flush out . It is very common for N's to get oil into the cooling system . I would make sure you have a thermostat in the system . Old school philosophy was take out the T Stat and run 40+ weight oil . A 180 degree NAA Thermostat is debatably better than the stock 160 degree unit . Running the motor in the optimal heat range will help disperse the oily gunk that is settling in the block . P.S. yes that is a water jacket . The N block does not have holes that go into the crankcase ( except the ones that are used by the valves and guides ) With just the head off all of the open holes go into the water jacket . All of the head bolts / studs go into the water jacket but some may be blocked by years of rust and corrosion . Best to let sleeping dogs lye , the blocked hole will not hurt anything but you might hydraulically break something if you goop up the bolt threads too much , that is if you have bolts . This post was edited by Ken(Ark) at 06:15:14 08/14/12. [Reply]  [No Email]