Absolutely frustrated with this Mercruiser engine

Scott215 said:
If timing chain jumped a tooth I don't think it would run as good as it does now. I personally have never seen that happen in 25 years of street racing and building motors
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Agree, raced a lot of cars, built a lot of 5.0 stangs, 350 Chevy, and in all the years i never ever seen one ‘jump a tooth’. Maybe back in 1930s. Its an old wife tale, just don’t happen.
 
Pirate Lady said:
Agree, raced a lot of cars, built a lot of 5.0 stangs, 350 Chevy, and in all the years i never ever seen one ‘jump a tooth’. Maybe back in 1930s. Its an old wife tale, just don’t happen.
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It does in a 1973 coupe DeVille with a 472 big block.
 
Pirate Lady said:
Agree, raced a lot of cars, built a lot of 5.0 stangs, 350 Chevy, and in all the years i never ever seen one ‘jump a tooth’. Maybe back in 1930s. Its an old wife tale, just don’t happen.
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O I have. Back in the day (60's through late 70's) the Chevy cam gears were plastic over metal. That plastic would break up and the chain would become very loose. Some I've seen so loose they would wear a hole in the cover.
 
ttmott said:
O I have. Back in the day (60's through late 70's) the Chevy cam gears were plastic over metal. That plastic would break up and the chain would become very loose. Some I've seen so loose they would wear a hole in the cover.
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Yep, Ford's did the same thing, only most times the plastic pieces would clog up the oil pump pick up before the chain would jump.
 
I always used double roller so never had issues
 
Scott215 said:
I always used double roller so never had issues
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So did most of us on a performance rebuild. OEM were plastic covered gears, and it was those that broke down on high mileage and the chain became loose. So loose that timing went off by up to five degrees even if it didn't skip.
 
I do remember those on the smog motors of the 70 s and 80s. They always ran like shit anyway. Especially in Cali with all the smog crap a 350 made 6 horse power
 
PlayDate said:
Perhaps the bigger issue is we haven't heard from the OP since May 12.
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Sorry, this pesky thing called work and family responsibilities have been getting in the way of getting to it and doing any work. Since I haven’t had a useful update yet to post here I was just lurking and reading the other comments. I’m hoping to get down there again this week sometime and try a few things.
 
My turn to take a kick at the can here. You guys have been discussing stuff well beyond my high school auto shop knowledge, but this issue does sound suspiciously like a problem we had during our sea trial last year.
 
Whoops, seems I hit enter too soon. Anyways I’m our case it was simply that 2 of the plug wires were switched - I believe it was 5 & 7. Mechanic switched them back and all was good.
 
My first car, 1979 olds cutlas supreme with a small v8 had the plastic boots on the gears that came off, made it til 140k miles, not bad. But witnessed it first hand as a 16ysar old kid…

ttmott said:
O I have. Back in the day (60's through late 70's) the Chevy cam gears were plastic over metal. That plastic would break up and the chain would become very loose. Some I've seen so loose they would wear a hole in the cover.
Click to expand...
 
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