TheHarv Posted August 28, 2008 Share Posted August 28, 2008 According to the 1997 workshop manual (and posted several times on this forum) the 300TDI lift pump pressure spec is Fuel lift pump pressure ..................................................... 42 - 55 Kgf/cm2 (3 - 4 lbf/in2) at 1800 rpm Is it just me or does this not make sense? 1kgf = 2.2lbf, and 1sq.in. = (2.54)^2 sq.cm. So 1kgf/cm2 = 14.2lbf/in2 A few lines down the same page of the manual the coolant expansion tank cap pressure is given as Expansion tank cap pressure ........................................... 1,06 Kgf/cm2 (15 Ibf/in2) (system pressure) which *is* a conversion factor of 14.2 In fact it looks like the kgf and lbf figures are the wrong way round i.e. should be 3 - 4 Kgf/cm2 (42 - 55 lbf/in2) Anyone got a FP gauge in theirs... ? Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted August 29, 2008 Share Posted August 29, 2008 I agree they need to check their sums: 55 kilogram / Centimeter squared is 782 psi. I can't quite see a Tdi lift pump managing that Quote Link to comment Share on other sites More sharing options...
ozzie1989 Posted August 29, 2008 Share Posted August 29, 2008 Type it in on google: 4 Kgf/cm2 to PSI and it'll tell you! You're right though, those figures are either the wrong way around or way out Quote Link to comment Share on other sites More sharing options...
TheHarv Posted August 29, 2008 Author Share Posted August 29, 2008 Type it in on google: 4 Kgf/cm2 to PSI and it'll tell you!You're right though, those figures are either the wrong way around or way out Hmm yes I use google's 'convert' quite often but in this case it doesn't seem to work, at least not from my part of the world. I'm tempted to think they're the wrong way round - OTOH 3 - 4 psi sounds rather low. Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted August 30, 2008 Share Posted August 30, 2008 3-4 psi sounds about right to me for a 300Tdi lift pump. That is why the engine will run quite happily without the pump working until you put your foot down. The 60psi TD5 pump is another matter, which is why they cost so much and go wrong so often. Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted August 30, 2008 Share Posted August 30, 2008 TD5 pump is another matter, which is why they cost so much and go wrong so often. Nah Jim... that's just called progress! Quote Link to comment Share on other sites More sharing options...
TheHarv Posted August 31, 2008 Author Share Posted August 31, 2008 thanks chaps Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted August 31, 2008 Share Posted August 31, 2008 Nah Jim... that's just called progress! Maybe I should change my avatar to this: Jim Quote Link to comment Share on other sites More sharing options...
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