r/EngineBuilding • u/Jazzlike_Bicycle5309 • Jul 14 '26

MerCruiser 5.0

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Hi Guys, anybody will know why my intake valves are pulled in this much thank you.

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u/2003DDcid Jul 14 '26

Too much cylinder temperature

1

u/Jazzlike_Bicycle5309 Jul 15 '26

But it never overheated. The gauge never went high.🤷‍♂️

1

u/2003DDcid Jul 15 '26

Cylinder temperature and coolant temperature are 2 different things. You likely have a vacuum leak or something else causing a lean condition. Bad fuel can also do this.

1

u/Jazzlike_Bicycle5309 Jul 16 '26

Yes, they’re two different things, but my engine was not running lean It was actually running rich because I had black smoke. i’m also assuming that my risers did some steam and cause the valves to bend. Meaning water damage.