Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: McCabe-Thiele (Ted) on March 29, 2021, 11:10:18 PM
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Whilst cleaning my lower crankcase yesterday I noticed this bolt/cap/plug not sure what it is as I see no reference to it in my manual.
The photo is upside down it is underneath where the points cover sits. Should I remove it ?
.(https://live.staticflickr.com/65535/51081789613_9cb293a4dc_k.jpg) (https://flic.kr/p/2kPVwoz)what is this cap-bolt (https://flic.kr/p/2kPVwoz) by Macabe Thiele (https://www.flickr.com/photos/187487200@N03/), on Flickr
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Not a 400 expert but on 500/750, its the oil gallery plug - oil travels along this to mains/big ends/etc. I always remove to clean oil ways properly - you can blow through to each main bearing oil feed for example
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On the other end is a little push in plug held in by the alternator cover and if you leave the cover of whilst starting the engine it will dissapear into a dim and distant corner plus large black puddle under bike
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Heat it up with a blow torch until you can smell the rubber getting hot and as has already been said, use a good socket or clamp it in a vice and turn the case to get it moving ;)
Once off, you can use a long bar to push the plug out the opposite end. A good clean out and replace the O' rings.
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Make sure you use a decent spanner/socket when removing it as they tend to round off easily.
Although the nut looks unmarked a 14mm socket seems a poor fit as the head looks almost as though its an angled top, 9/16 AF no better. I used my impact driver - straight off no issues. The other end is solid so I will put a bar through & tap it out.
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On the other end is a little push in plug held in by the alternator cover and if you leave the cover of whilst starting the engine it will dissapear into a dim and distant corner plus large black puddle under bike
Embarrassed to say I actually did that many years ago. Hard way to learn!!
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Don't remove it if you don't have to.
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I am considering whether or not to remove the one on my 750 while I have the cases apart, but am really concerned about chewing it up....as it's probably never been undone in the bikes 40+ year life. I can see the benefit of flushing out anything that would accumulate sludge and muck, but...can also see a nightmare of chewed ally and a plug that still didn't come out after I toasted the o-rings
Are they obtainable? I had a quick look and couldn;t see anyone selling them.
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I am considering whether or not to remove the one on my 750 while I have the cases apart, but am really concerned about chewing it up....as it's probably never been undone in the bikes 40+ year life. I can see the benefit of flushing out anything that would accumulate sludge and muck, but...can also see a nightmare of chewed ally and a plug that still didn't come out after I toasted the o-rings
Are they obtainable? I had a quick look and couldn;t see anyone selling them.
Clean the oil gallery, it's where most of the shite collects. I have the bungs in stock.
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I am considering whether or not to remove the one on my 750 while I have the cases apart, but am really concerned about chewing it up....as it's probably never been undone in the bikes 40+ year life. I can see the benefit of flushing out anything that would accumulate sludge and muck, but...can also see a nightmare of chewed ally and a plug that still didn't come out after I toasted the o-rings
Are they obtainable? I had a quick look and couldn;t see anyone selling them.
I've had no trouble removing with 6 point socket
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Thanks @Nurse Julie .... feel a bit happier trying to take out something when I know I can replace it.