Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: billdn on November 12, 2021, 02:54:28 PM
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Getting ready for the winter fettle and noticed this - carried out by earlier owner I guess! The bolt is an Allen head bolt going into the housing and there appears to be a steel dowel/pin going right through the housing (blue arrow) it protrudes by same length other side of housing, it looks like some cockeyed attempt to lock the Allen bolt in position. Why I've no idea ?
TBH I've never attempted adjustment of the cam chain, as I run on the it ain't broke don't fix it principle!
However I have a oil leak to l/h/s just below rocker box and I suspect an oil restrictor valve rubber has gone, so while I'm there have a look? Albeit would mean removing barrels etc and revealing what ever horrors lie within.
I'm loathe to remove/undo it as bike runs fine at the moment.
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Oops forgot to add pic! ;D
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Blimey, never seen that bodge before, I can't even work out what it achieved 😱😱😱😱
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Not some of Triggers work then!! ;)
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Not some of Triggers work then!! ;)
No Bill, Graham would throw those engine cases in the skip if he couldn't repair it properly. 'Do it right or don't bother doing it at all' is one of Graham's favourite sayings and he sticks to it rigidly.
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Thats not even the pinch bolt that locks the plunger, i think ts where the cap that locks the plunger goes.
Time for total strip out and repair using the stainless repair kit reported on elsewhere
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Whoever did that clearly had no idea how the tensioner works.
Hopefully you might be able to tap a small thread where the pin goes through the casing to cap off each end otherwise its what alloy welding?
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Thats not even the pinch bolt that locks the plunger, i think ts where the cap that locks the plunger goes.
Time for total strip out and repair using the stainless repair kit reported on elsewhere
Know the bit you mean Bryan, don't suppose it's an external fit without getting into engine he said hopefully 😉
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Whoever did that clearly had no idea how the tensioner works.
Hopefully you might be able to tap a small thread where the pin goes through the casing to cap off each end otherwise its what alloy welding?
Cheers Ted, made my day ;😂
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The machining can be done with the engine complete but its a risk with swarf and may well have to come out to get space BUT the plunger frequently siezes and the horseshoe gets damaged and they both need the cases split
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You cant leave that, why would somebody do that anyway, its not achieving anything???
Split them or you'll never get it out of your head when you ride it, thats not what riding's all about........Its supposed to be a stress reliever not a "mmm, best go easy now that i know that bolts there) scenario.
I couldn't leave that my head wouldn't have it, it'd be like knowing that the brake lines are leaking or similar! Bite the bullet and get t done......Sorry!
A tap that small is going to have a farty little thread and wouldn't be right and quite hard to do there. Besides it'd be a bodged bodge and wouldn't be a great one at that. Fix the route of the issue (the PO obviously thought there was an issue) rather than putting a sticking plaster over it. The actual ally weld wont be expensive, it's just a time thing to get over splitting the cases.
Dont mean to be the harbinger of doom, apologies ::)
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Funny never really looked before , had the bike since 2007 , bad mechanic me, as said earlier if it ain't broke I don't fix it but you've all got me thinking now 🤔🙄😟
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Most likely the tensioner is seized on the horseshoe pivot but if the cam chain is not rattling you could attempt a repair without stripping the engine for a couple of years. If you do decide to take the engine out be warned you can easily spend a grand in parts etc.
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Yeah, but think of the 'fettling joy' :o ;D ;D ;D 8)
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Yeah, but think of the 'fettling joy' :o ;D ;D ;D 8)
And it's nearly winter so not riding but fettling time of year. Start it now and you'll be back on the road for Spring :)
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And post regular updates please to keep us all going over the winter with bike related 'stuff'.
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.......hear hear!
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What do you mean its cold in your shed / garage / car port/ lean-to /back garden - never heard of sub zero Tog rated Canadian Pylon Riggers Overalls?
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;D ;D
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I suspect that the original bolt thread is mullered and won't hold the Allen bolt in place so the cases and bolt were drilled through and the pin banged in. Mega bodgery of the worst kind.
The cam chain horseshoe must be stuck after all this time and almost certainly getting eaten by the cam chain. If it was my engine I would have to split the cases and investigate how much other bodgery is hidden inside. :o
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Hope you all had a good and safe and well Christmas. So with festivities over I ventured to the man cave, determined to resolve 1) Pesky oil leak and 2) the earlier mentioned cam chain tensioner bodge, see earlier picture.
I've no removed head and barrels and think I may have issue with the pistons! and valves or is this just old engine, never taken one apart before. seems a lot of carbon build up, is this the usual quantity. The bike ran fine with no blue smoke issues.
The oil leak was caused by a split rubber collar that goes around dowel on LHS but the one on the right is knackered also..
In my laymans opinion, or novice mechanic the bores, thank fully look really smooth with no gouges/scoring etc. The pics don't show it very well.
So whatdya all think. Haven't got to the offending bodge yet.!!!
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I would say that is NOT excessive carbon for a bike used for short journeys.
Its impossible to tell bore/piston/ring wear from pictures.
Pistons and bores need accurate measuring tools to determine clearance and ring gaps need to be checked.
When that far down always change valve stem seals
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The only carbon that looks excessive to me is maybe No3 piston my engine was low on compression resulting in poor cold first start - hence the reason for full strip & rebore. .
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Cheers Bryan and Ted, not seen inside a working engine before so that's reassuring. 👍 Going to be a busy winter!
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Finally getting down t o details on this "bodge", while clever it obviously ain't right.
It appears thread for cam chain tensioner adjuster bolt has been stripped or otherwise in it's past life.
Someone has inserted a tapped metal bush to receive an Allen bolt. What looked like a pin right through is in fact 2 pins either side holding in the bush.
So I guess remove bush and check sizes to see if the stainless adjuster I've seen used will fit.
Interesting bit of work though I thought.