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#1
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first compression test
I did my first compression test today and these are the numbers adjusted for the higher altitude where I live, about 5300 ft. The car is an 84 300D with almost 141k miles on it.
From cylinder 1 to 5 in PSI: 424 400 400 412 376 According to the shop manual, these numbers are right in the "normal" compression range, but why is cylinder 5 so low and 1 so high? Thanks. |
#2
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Quote:
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1998 E300D, 287k, barely broken in. |
#3
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You valves might need adjusting. Tight valves cause low compression.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#4
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Not that that is really low. Mine are all in the range of your low one.
Edit: just saw that you adjusted the #s. Please post your actual readings. Compression gauges give a reading of gauge pressure (pressure relative to the surrounding atmosphere) and do not need to be corrected in any way.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine |
#5
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Quote:
350, 330, 330, 340, 310 However, in order to compare my numbers to the FSM, I need to adjust them because I live at a significantly higher altitude than sea level. 24-30 bar (348-435 PSI) is the normal range listed in the FSM. Compression will naturally be less where I live, because the air is less dense than at sea level. In order to compare apples to apples, the numbers must be adjusted for elevation.
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cbjukraine '84 300D |
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