Craigb
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Everything posted by Craigb
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Now the bottom end is sorted it shouldn’t be long before the saw is back in one piece. I’ll stick with the coil that came with it but I reckon I need a new one. We shall see. The carb is the next bit for a fettle. The tank and fuel pipe are fine.
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Crank seal fitted. Despite the lack of an o ring on the sleeve the case holds both pressure and vacuum.
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Also I’ve heard of an o ring sitting under the sleeve, mine doesn’t have on as it appears many don’t. Would a smear of sealant like hylomar blue on the crank help?
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When I comes to the crank seal, do you put it on the crank sleeve first and then into the case or put the sleeve on the crank and then install the seal?
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No arm and no propeller. I need a new pinion then.
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Should there be a seal between the oil pump and the casing? Also my plastic oil pump drive gear doesn’t have an ear on it like the ones I’ve seen on L and S, is that an issue?
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71163946866__214C1276-B1FC-4DE6-A659-60E576532087.MOV Air leak. Flywheel side is good but I might do the bearings seen as I’m so deep into it.
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The last 346 I did up burped into life momentarily even with the pot loose.
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The new pot and piston that is on the saw is brand new with no carbon on the top of the cylinder. I need to set some time aside to do a leak test which I should be able to do this weekend.
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Wd40 didn’t get it to fire and neither has fuel down the spark plug hole. This is what initially lead me to looking at the coil, which does produce spark. I’ll take the fly wheel off to make sure the keys aren’t shafted. I’m not a small engine specialist but I am a welder with a sound knowledge of basic mechanical principles, hence the reason for my questions on this forum. The previous two saws I’ve rebuilt run well, it’s just the lack of even a fart of a start that has got me puzzled. I’ve tried two different plugs also.
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Maybe I didn’t put enough in. I only poured a drop in. Literally a drop or two out of a pipette
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I dread to ask but what would you hazard a guess at? This saw better not be a lemon.
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Sorry for the confusion. I think we could all agree if the three of us were looking at the saw in person there would be no ambiguity. I’ve had very limited time to solely focus on this saw. I think you are right in saying I’m getting false reading with my compression gauge because the compression feels ok judging by the force needed to pull the rope. You can indeed hold the saw by the pull start and it slowly drops at intervals relative to the stroke if that makes sense. It definitely doesn’t just plummet. I’ll vac and pressure test it. I know the vac tester is good.
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No the gauge hasn’t been tested yet.
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For clarity this saw arrived with me with a new piston and cylinder on it and it came with the original piston and cylinder in the box. The piston you can see in the pictures with two rings is the new one. The original piston and cylinder that came with it was badly scored on the exhaust side. Whoever had it before said it started with full throttle once but they couldn’t get it to fire since. It came with a new spurious coil in the box with the blue one on the saw. Judging by the double gasket on the exhaust the previous owner didn’t build it correctly when they put the new cylinder on so who knows what I’ll find when I strip it back.
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Meteor piston coming in the post. I’ll inspect the bottom end when I take the cylinder off.
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Also I’ve just found a second exhaust gasket that was between the shield and the muffler.
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I’ve fettled the oem piston up and got the transfer and scoring out of the cylinder.
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Here’s the plate
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The plot thickens. So whoever had the saw before me put the exhaust gasket on first then the shield. Also the piston is in good nick but has two rings. It isn’t oem as the saw came with the original piston and cylinder which were scored, but they had one ring. I’ll take the top cover off to see if I can identify which brand the new cylinder is.
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I’ll pull the exhaust off tomorrow and have a look and I’ll put the compression gauge on a saw I know works great to check it. I’m wanting to cover most things on this thread in an effort to provided an easy to find trouble shooter for anyone rebuilding a 372. Starting from the top down. I’ll put pictures up as I go and hopefully the collective knowledge on 372s can be captured.
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Bad isn’t it.
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75 psi compression. I think the decomp might be knackered.
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Is it wired wrong?
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I’ll shrink wrap it. This is how the saw came to me
