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03-02-2011, 05:52 AM #1
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Merc Manual 2001 300x Compression ?????
Anyone with a 300x manual that covers 2001, S/N OT235158, what's the manual call out on compression ??????? I bought a new Merc manual and I've already found lots of errors besides the one page revision sheet they put in for all the corrections and I think this is just another one, they list compression @ 110-115
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Thx,
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03-02-2011, 04:00 PM #2
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300 ProMax/Super Magnum shop manual (pre X models) specs compression @ 120-130 psi.
Compression to be checked w/ throttle plates @ WOT.
Doesn't spec hot or cold.
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03-02-2011, 04:29 PM #3
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having the same
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03-03-2011, 07:44 AM #4
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the x motor compression will be different then the promax/super mag. what numbers are you coming up w/ gary?
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03-03-2011, 09:20 AM #5
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Charlie,
Originally Posted by mrcrsr
I haven't done a compression check yet, although I will this weekend. Reason for asking is as I was reading the manual the other night, it quoted compression for the Merc 300x at 110-115 psi for my year & S/N motor, I just thought that to be way to low. That's basically 225/250 compression. I was expecting to see 125-130 compression for the 2001 300x, I'm I way off here ?????????
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03-03-2011, 04:11 PM #6
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Charlie,
UPDATE:
I got home early today and ran the compression test. Manual says 110-115 psi on my 300x and I'll have to say the manual is totally wrong. On a cold motor I ran all 6 ranging from 145-149 psi. So much for a $90 manual to guide you through your motor.........
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