SOHC.co.uk Forums > CB350/400
CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
Integra99:
Nice work... looking lovely! on the homebound stretch now!
taysidedragon:
Looking good. There might be a problem with that camshaft though! ;) :o
Nurse Julie:
--- Quote from: taysidedragon on January 12, 2018, 11:25:13 AM ---Looking good. There might be a problem with that camshaft though! ;) :o
--- End quote ---
Yep, it will never work ;D ;D ;D
Nurse Julie:
Going back 2 days.
The barrels have been rebored to +.50. The rebore was done to a physical piston and the barrels were cross hatched. The tolerance is about 1 thou.
I fitted the rings to the pistons. The bottom ring or oil ring has 3 parts to it. With these 3 parts you fit the spacer ring on the piston first and then 1 rail on top and one underneath making a spacer sandwich. The second ring goes in the middle groove of the piston and has a very square cut face to it. The top ring has a little sort of chamfer on the top and bottom edge. Any markings on the second and top rings have to face upwards. Luckily, Trig just happened to pick up one of the pistons and although I thought I had checked to make sure I put the rings in with the writing facing upwards, there was one top ring facing downwards……how pleased am I that he noticed my cock up.
All the rings were staggered around the pistons at approx. 120°.
The circlip was then fitted to the farthest side of the pistons from the side I was working and the pistons put on top of the con rods with the arrow on the piston facing the front of the engine and ‘IN’ facing the rear and the gudgeon pin pushed through from my side. Then the other circlip was inserted with the little tail pointing downwards. I actually found the circlips quite difficult to get in, not because they were particularly tight but I just couldn’t seem to get the angle right with the thin nose pliers so I got Trig to do them for me as I was worried about bending them out of shape.
I put the dowels in and as these dowels have oil coming up through them, Trig said that he always fits an ‘O’ ring around the dowel, just in case. This ‘O’ ring is not mentioned anywhere in the service manual and does not come in the gasket set. Trig punched out the hole in the gasket just a little larger to accommodate the seal. I then fitted the gasket, trying it both ways round to make sure I had ‘the best fit’. In fact this pattern gasket set has been very good for sizes, shape, holes in the exact right place etc. I then dropped in the cam blades making sure they located correctly.
The 3 part oil rings
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The top ring
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The second ring
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Big 'O'rings around the bottom of the barrels
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The extra 'O' ring Trig fitted
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Nurse Julie:
The gasket and the pistons fitted to the con rods
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The positioning of the circlip holding the gudgeon pin in situ
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We then fitted the barrels over the pistons. I was quite concerned about this and was not even going to try and do it without Trig helping me. It was actually very straight forward. We lowered the barrels down over the studs to just resting very gently on the top rings, we compressed the top rings using our fingers and by just applying gentle pressure, the barrels slipped over a treat. We did the same with the second rings and then the same with the bottom oil control rings. Once all the pistons were in the barrels, it was just a case of smacking the barrels down with your hand until they sat on top of the bottom casing.
The pistons / bores then had a good squirt of oil applied and we manually turned the engine over quite a few times to get lubrication down the side of the pistons. Then some Graphogen was applied and again, the engine turned over manually to get the pistons moving up and down.
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I then put in the oil jets with their new seals and the stud dowels with their new stud gaskets.
The oil restrictor jet and stud dowel with gasket.
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