Cinnamon 75 Duster \
Got the engine back together. Again, my goal for now was just to freshen it up a little and stop any leaks. In this process I consulted a lot of posts and articles on here and slantsix.org.. Particularly the info from slantsixdan and Doug Dutra were very valuable.
Apparently it was rebuilt previously. Bearings looked good and were in spec except for the cam. Even those probably would have been OK for a while if I had not disturbed them. But, when I pulled the cam I saw hairline cracks in the babbit and found that it was separating, so needed to replace them. I wonder if they hot tanked this thing and did not change them? I made a tool from a socket and a cork to install new ones (pic). Dimension was perfect except that it was too big to go through the narrowest hole for the back bearing. I had to knock that one out with a brass punch.
I don't have any way to measure the cylinders, but the walls showed no problems and still had a trace of crosshatch all the way around. The rings were still well within 'service' range on end gap, but were pretty grungy, plus since I decided to run a hone through it I was afraid I'd lose too much ring when they 'reset', so I replaced the rings.
The cam and lifters were OK, but definitly original and showing it. I may rework this thing for more power at some point, so chose not to change them. I did add an oil hole above the fuel pump lobe (Dutra) cause it was starting to gouge. It wasn't having a problem getting fuel as it was. So, between that and a new pump with slightly wider footprint I think it will be fine.
Head/valves looked good. I just lapped them enough to clean the seats. Put it back together with new oil seals on the stems.
Other than that it was cleanup and re-assemble... and a little paint.
Got the engine back together. Again, my goal for now was just to freshen it up a little and stop any leaks. In this process I consulted a lot of posts and articles on here and slantsix.org.. Particularly the info from slantsixdan and Doug Dutra were very valuable.
Apparently it was rebuilt previously. Bearings looked good and were in spec except for the cam. Even those probably would have been OK for a while if I had not disturbed them. But, when I pulled the cam I saw hairline cracks in the babbit and found that it was separating, so needed to replace them. I wonder if they hot tanked this thing and did not change them? I made a tool from a socket and a cork to install new ones (pic). Dimension was perfect except that it was too big to go through the narrowest hole for the back bearing. I had to knock that one out with a brass punch.
I don't have any way to measure the cylinders, but the walls showed no problems and still had a trace of crosshatch all the way around. The rings were still well within 'service' range on end gap, but were pretty grungy, plus since I decided to run a hone through it I was afraid I'd lose too much ring when they 'reset', so I replaced the rings.
The cam and lifters were OK, but definitly original and showing it. I may rework this thing for more power at some point, so chose not to change them. I did add an oil hole above the fuel pump lobe (Dutra) cause it was starting to gouge. It wasn't having a problem getting fuel as it was. So, between that and a new pump with slightly wider footprint I think it will be fine.
Head/valves looked good. I just lapped them enough to clean the seats. Put it back together with new oil seals on the stems.
Other than that it was cleanup and re-assemble... and a little paint.