The Shop > Tools
Compressor quandry
John Rudd:
:update:
Right, its all nicely stripped cleaned ready for re-assembly one way or another.....
The gudgeon pin is completely useless, it has worn eccentrically on the ends .....
The piston is worse for wear, the gudgon pin bosses are not in good shape and will need reaming oversize.
The conrod is worn to the point that the pin rocks about, in fact you can see daylight between the gap above the pin with it sitting on the bottom of the l.e.e.
So, I could bore out the conrod l.e.e, think I'd have to do that in the mill. The outside is too irregular to fit in the 3 jaw on the lathe....and expect it to run true(-ish...)
Machine up a new gudgeon pin, I cant finish grind to size, so will have to polish with Wet n Dry.....
Bush, got some 3/4" pb, turned down to 16mm to fit into conrod, then ream id to fit pin.
Next up, ream the piston bosses, same diameter as the id of a pb bush....thats doable...
As for reamers, I have a set of adjustable that will accomodate the sizes I require, but are they the right way to go?
I remember doing kingpin bushes with adjustable reamers, so mebbe this the right approach?
Comments?
Btw, new piston/pin/conrod will cost me around £55 from Machinemart....
hermetic:
Hi John, The thing you will have to be careful of is to get the small end bush reamed at 90 deg to the bore or you will put unequal pressure on the sides of the piston. £55 for new parts sounds almost reasonable, given the amount of work, and the hassle of getting the small end reamed square with an adjustable reamer. On the other hand if this has failed due to a bit of under engineering in the original design, to do what you have suggested will improve the thing no end, if there is enough meat on the small end of the con rod!
John Rudd:
Hermetic,
I think you could be right...for the money.....£55 works out to be less than two hours work.....Think I'll just order the bits.... I'd like to sort this asap, as I'm going to Oz next Monday for four weeks...I'll have forgotten what I'm doing when I get back...
I think most of the repairs required are down to poor maintenance, low oil level.... Lube is by splash...
Another thought, if I ream the piston bosses, the clips holding the pin in will need new grooves machining for bigger clips, the orig ones may be too small? :Doh:
AdeV:
Hi John,
You do have to answer the question to yourself: are you doing this because it's fun? Or because you need a compressor?
If it's the fun/learning and general enjoyment of machining, then I'd say DIY.
If you need the compressor, and you've got more interesting things to machine, then frankly £55 doesn't sound that expensive - and you'll still have the knackered bits if you fancy a go at it later. And you'll have a working compressor...
I'm quite lucky I suppose, I've got 3 compressors (admittedly, one is attached to an ultra-temperamental Villiers petrol engine), a large standalone receiver, etc... so I'm kinda spoilt on the compressor front. All of mine run ridiculously well...
John Rudd:
Answer: Well its fun machining bits for a repair..... :dremel: but at the same time, I do need a bigger machine to power my blasting kit that I have, a pot and a cabinet....my smaller 14cfm compressor only has a 90 l tank, so 150l will last a bit longer but will take that bit extra to fill...
I've ordered the bits to effect a repair, they should arrive Wednesday, so it should all be back together and working same day....I'll have my holiday time to think about whether to keeep or sell....should fetch £250-300 on ebay if I do..... :scratch:
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