I have just got my beloved Westie back after an engine swap - JX TD to AGG and am now clearing up the various niggles (large and small) that the outfit I paid left behind (I won't name names yet because it could still get messy).
Apart from rewiring all the bits like fog lamps, my cruise control and battery monitor (if they didn't know what the wire was for they cut it off!!!) I have two main concerns that appear to be interconnected:
Oil Pressure - One reason I replaced the JX was performance and chronic low oil pressure which always left me worried (never got more than about 30psi even after a new oil pump). Now I have the performance (it will happily pull 65-70mph on a dual carriageway) but oil pressure is alarmingly high - typically 80-100psi at anything other than low revs. I believe my pressure sender is over-reading since when I measured on my mechanical gauge it was about 80psi rather than 100 - but this still seems very high (although I would rather be there the very low!!!). Any thoughts, comments, experiences on this one?
Rev counter - my van came back without the rev counter working which I find most distracting. Claimed the alternator didn't have a W output. I checked with a scope and there is a nice signal coming out, even though the wire wasn't connected. Rectified that and hey presto my standard diesel tach starts reading what appears to be fairly accurately. Then the bloody oil light and buzzer of doom starts going off! Now I know this is triggered by low oil pressure above 2000rpm, but the oil pressure on the gauge is still above 80psi so there must be some set of conflicting signals coming from the pressure switch, rev counter and the circuit board behind the speedo. I'm starting to wonder whether the rev counter "wasn't working" as a means to suppress the buzzer!!!. I don't think this should be normal, but what have other AGG converts found?
Mechanically these guys did a reasonable job, and that was the bit I couldn't do, but electrically I am very suspect and over the winter will probably strip the loom and rebuild it with fully soldered joints and make it look pretty. It will also help me discover how the whole lot works - I like to know this kind of stuff.
Any thoughts, comments, suggestions on either topic (although I'm convinced it is the same overall issue and is electrical rather than mechanical). Assuming nothing goes completely amok in the next 2 weeks we are hoping to be at Busfest so I will be on the lookout for other conversions to understand what is going on.
------------- Steve
1991 Westfalia California with AGG conversion (from JX)
|