Bonus connecting rod weight 2g variation 811 to 813.. think I'll leave them alone. Specially as the 811 flickered to 812 and so did the 813.. Tried a bodgy end to end weight by balancing one end on an old cam lifter getting them all in the same place and same less than variation both ways ...happy days
we balanced ours to 0.1g using the conrods as dead weights on a force transducer (Im certain the rods had been weight matched by the PO) Its surprising how keen they are to rev when things like that are carried out! We also measured rod length, piston length and matched short rods to long pistons and long rods to short pistons
..and finally to get me up to date with progress. . Took gear off old camshaft. Drilled through most of flatenned rivet hit it hard with a punch and they pop out. Do I just drill these holes out big enough to fit the Webcam bolts? No tapping or the threads won't match the ones on the end of the new cam.. and won't seat properly I assume. .. and loctite them in... to 18ft-lb? ( can't see any note on this in instructions...) Edit.. After. Night of re-watching Jake Raby..looks like no tapping. 14ft-lb he didn't loctite either but I think I might...
While I'm here... crank polishing.. Do we bother... just to clean off oil marks ? Edit. ...Exciting Friday night at in!.. Tom Wilson book. Polish with oiled 400 emery cloth to a bright shine apart from oil seal area where polished but not bright.. Idea being on all to clean and lightly texture to hold oil..
We where pleased ourselves! Luckily we have transducers which are sensitive enough to measure to three decimal places I want to build another one now, go a bit more adventurous 2276 or 2400 maybe
Anyway... Moved onto the heads for a but of short motor relief... Gentle tap with a hammer on the valve head to free up the spring as its been sat for 5 years or so and.... End fell off valve! Good job I'm replacing the exhaust valves and guides.. . What do I do to the slightly loose inlet guide?..
The holes in the cam gear will need opening for the bolts and the face will need machining to loose the indentations for the old rivets. The bolts won't sit right otherwise.
When I replaced my guides ,they were seriously tight ..if yours is loose the head needs machining and an oversize guide fitted ...
Got from this To this With some paraffin bushed in for 5 mins then hot soapy water and a brass brush Guides pulled out OK too.. Just the one that wasn't going to be pulled that spins to deal with then into the oven at gas mark 6 for while and guides in the freezer.. Quick spin with some valve paste and should be good to go!.. Unless anyone can come up with more work I probably have to get done that I don't know about yet..
Quite day clearing the mess I've been making all week cleaning oil off stuff.. And measuring.. Valve no 4 , the one with the loose guide has a stem worn down to below wear limit from Bentley.. All others OK spare from the exhaust one from No 3 that sapped on removal.. Going to replace the exhausts ones anyway.. Top of inlet valve 4 looks mullered too tho' Might try a STD guide first to see if it was just a dodgy one but if I need an oversize one where do I go? and I guess it has to go to somewhere special to have the head re-drilled to the kind of tolerance to take one..
Thanks Mr Weeding... Stateside came back after our call and are getting some in the post but thanks for the offer.
Cylinders Pistons & Rods More cleaning weighting and measuring... Looks like No 3 had a bit of trauma in the past too.. So got these Now adjusted weights to 1g by taking a bit off rod by bolt and off skirt of piston after adding rods and pistons and seeing a 3g diffence!! not quite 0.1g but my kitchen scales don't go that far New style oil rings don't seem to close up the same as the top two with the new ones just sneaking in below the wear limit.. Cylinders just past half of wear limit hopefully give us a few good miles of service.. Gave the cylinders a quick deglaze ... Rightly or wrongly opinion seems to be divided For references in case your looking for numbers Bentely says..bit picture heavy here sorry.. Ring Gaps Got like this Used piston inside cylinder to sit ring evenly in pot Side Gaps Got like this. Ring names for reference Cylinder tolerance Cylinder measured at top in a couple of directions use biggest number, piston across skirt..
Quick play with some new toys to test. ... 3/8 NPT tap fits nicely on a 13mm socket to wind it in How far should those threads go in then? Went for the NPT aluminum plugs in the end.. found a set of taps to suit cheap on fleabay..just testing to see what it might be like.. Will do them all and give the galleries a clean before 'glueing ' in with loctite 243. or should I use the Permatex Aviation ...or Curil T....or Dirko HT or good old blue hylomar...spoilt for choice on sealants now... Oh and went for a 14.5mm drill for the 3/8 NPT tap the 37/64" bit I got was a straight shank and wouldn't fit in the drill..... So just a tip if you're getting one... Works OK
