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| No shifting until 120 degrees? |
| Author |
Message |
    
Chun Yi
Member
Username: juniinc
Post Number: 10
Registered: 08-2009
| | Posted on Wednesday, October 07, 2009 - 01:50 pm: | 
|
1991 Four winns sport cuddy with OMC 4.3 I/O.
My manual says "allow the engine warm up to at least 120 degrees before shifting into gear?
Is that true & why?
Thanks in advance. |
Hy Stat
Senior Member
Username: hystat
Post Number: 1509
Registered: 05-2007
| | Posted on Wednesday, October 07, 2009 - 02:00 pm: |
|
Why it says that:
Cold aluminum pistons are not round. They are slightly oval.
Placing an engine under load when the pistons are slightly oval can damage the pistons and cylinder bores.
Once they get warmed up, the pistons become round and fit the round bores of the engine block better. |
Chun Yi
Member
Username: juniinc
Post Number: 11
Registered: 08-2009
| | Posted on Thursday, October 08, 2009 - 11:40 am: |
|
That explains it all.
Thanks much Hystat. |
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