First time to post, though I have lurked off and on for several years - mostly on the Ozz engine list.
I have had this problem twice now - engine begins to seize shortly after being rebuilt.
Rebuilt my Ford 170 (250K miles on engine and not the first time that I've rebuilt it); 0.040 over on bore, crank ground, rods reconditioned, Clifford Cam, head: milled approx 0.060 (47cc combustion chamber size), largest intake and exhaust valves from 250 cid, port divider...., rotating parts dynamically balanced. My Falcon was undergoing its qtr million mile renovation and so the engine saw lots of idling time before the car was complete enough to drive on the street. First 150 miles of driving on surface streets - stop & go - prior to freeway use. At 190 total miles of driving, while on the freeway, the engine began to loose power and sound rough (as if the timing had slipped - my initial diagosis as I was slowing down to exit the freeway). By the time I shut it down it was clattereing like a spun rod bearing. Tear down showed serious galling of the piston to block in 3 cylinders. Initial wear appears to have started over the width of the piston skirts. The consensus amoungst those that I discussed/showed the damaged parts to was that the prolonged idling at break-in was the culprit.
Replaced block with '65 170, block bored 0.020, new Silvo-lite (sp) pistons, reused all other dynamic parts & head from the '61 engine. Broke the new enigne in by the book. At 290 miles the second engine began to loose power. I got this one shut down a bit sooner and the damage was not as severe but still some of the pistons had significant wear. One bore had grooves about 0.015 deep, two other bores had the cross hatching worn away but no grooves.
Now I have aquired a '66 200. After pissing away over $2000 on the first two engines, I am simplying reringing, new bearings & timing chain - all tolerances are near the high (loose) limit. I don't want this problem again and I certainly do not want to pull an engine out of my very nicely painted engine compartment for the 3rd time!
I have yet to figure out the cause of the failures. Major parts shared between the two engines: head, crank, rods, cam. I am down to one possible cause but I find it doubltfull - I'm refraining from posting that speculation until you have given it some thought and hopefully responded. Thanks for reading this long post - speculation gladly accepted.
I have had this problem twice now - engine begins to seize shortly after being rebuilt.
Rebuilt my Ford 170 (250K miles on engine and not the first time that I've rebuilt it); 0.040 over on bore, crank ground, rods reconditioned, Clifford Cam, head: milled approx 0.060 (47cc combustion chamber size), largest intake and exhaust valves from 250 cid, port divider...., rotating parts dynamically balanced. My Falcon was undergoing its qtr million mile renovation and so the engine saw lots of idling time before the car was complete enough to drive on the street. First 150 miles of driving on surface streets - stop & go - prior to freeway use. At 190 total miles of driving, while on the freeway, the engine began to loose power and sound rough (as if the timing had slipped - my initial diagosis as I was slowing down to exit the freeway). By the time I shut it down it was clattereing like a spun rod bearing. Tear down showed serious galling of the piston to block in 3 cylinders. Initial wear appears to have started over the width of the piston skirts. The consensus amoungst those that I discussed/showed the damaged parts to was that the prolonged idling at break-in was the culprit.
Replaced block with '65 170, block bored 0.020, new Silvo-lite (sp) pistons, reused all other dynamic parts & head from the '61 engine. Broke the new enigne in by the book. At 290 miles the second engine began to loose power. I got this one shut down a bit sooner and the damage was not as severe but still some of the pistons had significant wear. One bore had grooves about 0.015 deep, two other bores had the cross hatching worn away but no grooves.
Now I have aquired a '66 200. After pissing away over $2000 on the first two engines, I am simplying reringing, new bearings & timing chain - all tolerances are near the high (loose) limit. I don't want this problem again and I certainly do not want to pull an engine out of my very nicely painted engine compartment for the 3rd time!
I have yet to figure out the cause of the failures. Major parts shared between the two engines: head, crank, rods, cam. I am down to one possible cause but I find it doubltfull - I'm refraining from posting that speculation until you have given it some thought and hopefully responded. Thanks for reading this long post - speculation gladly accepted.
