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Power Strokes
7.3 Tech
7.3 Ring end gaps, WTH?
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[QUOTE="MeTo, post: 1506176, member: 23681"] For the people who have done their own rebuilds; Did you stick to these specs? Bore: 4.11” Rule of thumb, 0.004"/inch of bore. Navistar uses the wider end gap to aid in oil control, and to lower engine emissions. Using a wider end gap in the second ring land evens out the pressures in the ring land area of the piston. Top - .014"-.024 Second - [COLOR="Red"].062"-.072"[/COLOR] Oil Ring - .012"-.024" Is this based on the old piston design or metallurgy? What about Mahle? I'm going to contact Mahle and Hastings to hear what they have to say about the second ring end gap and if that spec needs to be used with their products? [/QUOTE]
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