What type EGT probes
12-01-2015 | 10:18 AM
#23
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Joined: Oct 2007
Posts: 8,439
Likes: 94
From: yorkville,il
Dan caught alot of slack from the video he had with thr gopro mounted in the bilge, showing smoke coming out of the breathers. At the time of the video, he also had a moisture issue with his oil, and had a significant amount of milkshake going on. I believe what was coming out of the valve covers in that video, was actually steam, and not oil smoke.
Irregardless, those engines consumed a bunch of oil, and were due for rebuilds.
Im no expert on failure analysis, his rotor screws had came loose from failed lock washers on one engine. The rotor screws were so loose, it allowed the rotor locating tab, to even become disengaged from the distributor.
My initial thoughts, were the timing became excessively retarded while he was running wfo for a long stretch during his last boating outing, piston got extremely hot, and began scuffing the bore, and tuliping an exhaust valve.
The other engine, which had the same tune, had no damage, still showed good on the compression test and fair on the leakdown. Engine with rotor coming loose, had damaged piston, and tuliped exhaust valve.
Thats just my theory, and it could be way off.
Irregardless, those engines consumed a bunch of oil, and were due for rebuilds.
Im no expert on failure analysis, his rotor screws had came loose from failed lock washers on one engine. The rotor screws were so loose, it allowed the rotor locating tab, to even become disengaged from the distributor.
My initial thoughts, were the timing became excessively retarded while he was running wfo for a long stretch during his last boating outing, piston got extremely hot, and began scuffing the bore, and tuliping an exhaust valve.
The other engine, which had the same tune, had no damage, still showed good on the compression test and fair on the leakdown. Engine with rotor coming loose, had damaged piston, and tuliped exhaust valve.
Thats just my theory, and it could be way off.
12-01-2015 | 10:49 AM
#24
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Joined: Jun 2005
Posts: 8,407
Likes: 797
From: Central IL
12-01-2015 | 11:42 AM
#26
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Joined: Oct 2007
Posts: 8,439
Likes: 94
From: yorkville,il
i am not sure that retarted timing will effect the a/f ratio reading,the cylinder was still firing.maybe one of the younger tech guys will know,seems they have ALL the answers,i am still learning.
Last edited by mike tkach; 12-01-2015 at 11:44 AM.
