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D7 engine cases
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Robert James
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March 17, 2019 - 9:54 am
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i have a D14B engine with the casings cracked and unrepairable....there is a pair of d7 crank casings for sale on p bay ....my question is will the inners from the D14B fit in the D7 cases I’d not does anyone have a pair of D14B cases cheap.  Cheers

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wildun
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March 17, 2019 - 10:31 am
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No, sorry, D14 and D7 crankcase (inners) are not interchangeable. The D14 is four speed gearbox, the D7 is three speed gearbox, totally different. So you need to continue looking for D14 crankcases, then everything will fit. B175 cases are very similar but even rarer and more expensive,

1951 Bantam D1 125, 1954 Bantam bitsa, 1970 Bantam B175, all Bantams on the road and ridden regularly, 1995 Yamaha Diversion 900 and 2016 Honda Integra 750 scooter. Horses for courses, all very different to each other, but a bike for every occasion.

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sunny
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March 17, 2019 - 10:52 am
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is  this  CRANK   cases as  i  have  some  outers   for  sale     please  put  up  a  photo   weed  like   to  see erm   

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Blue Heeler
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March 17, 2019 - 12:27 pm
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Most cases are repairable, let`s have a look....or email pics to someone so they can put them on here if you have computer etc issues.

Reason I suggest repair is because D14 crankcases are becoming harder to find, but you may be lucky.

You could always stick a complete D7 engine in to tide you over, last one I picked up from Grimsby was £50 a few year`s back. Seen them below a ton recently.

Blue

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bantammad
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March 17, 2019 - 12:34 pm
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Hi bantammad ere you say that your cracked cases are un repairable have you shown them to a tig welder it’s amazing what can be done the cost for replacing them is getting expensive get some advise on repair cost from an expert regards Les

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SpacedMarine
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March 17, 2019 - 1:09 pm
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Depending where they're damaged and whether or not the area is load bearing epoxy may be your answer.Plus you'll have no warping as you may get with welding.You have nothing to lose but time!

What's 7/16 in mm again?

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Blue Heeler
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March 17, 2019 - 4:41 pm
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Check out welding on this guy`s crankcases....** Please log in to view **

Blue

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Mags 1
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March 17, 2019 - 5:13 pm
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John Mills is doing a second lot of TIG welding for me, an earlier one showed three D7 cases being built back up in the rear chain/stator area and others, very reasonable.

Four now on the road and at least several in bits.

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bantammad
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March 17, 2019 - 5:22 pm
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Hi bantammad ere I agree with the use epoxy resin used it to repair a cracked engine block on a Drott B100 that machine carried on working loading coal trucks and never did get welded so yes certain cases?? Regards Les

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wildun
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March 23, 2019 - 10:49 pm
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On Ebay now, not mine.

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1951 Bantam D1 125, 1954 Bantam bitsa, 1970 Bantam B175, all Bantams on the road and ridden regularly, 1995 Yamaha Diversion 900 and 2016 Honda Integra 750 scooter. Horses for courses, all very different to each other, but a bike for every occasion.

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Mags 1
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March 24, 2019 - 1:25 am
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Robert James said
i have a D14B engine with the casings cracked and unrepairable....there is a pair of d7 crank casings for sale on p bay ....my question is will the inners from the D14B fit in the D7 cases I’d not does anyone have a pair of D14B cases cheap.  Cheers  

I think you need to tell us exactly which casings are unuseable and which are, and why.

You can't put crankcases from a D7 into the D14 inners because they're both inners, do you mean outers?

Which casings on the D14 are cracked?

You can very certainly build a four speed D7 up with D14 inner crankcases, you'll need a D7 crank mind, and the four speed gears etc. you will also need  the D7 outer casings and will only have to drill and tap about three or four new threaded holes, it's what the trials boys sometimes do, that's why you occasionally find D14/B175 cases with the engine numbers ground away and others sometimes (D7) amateurishly put in place.

Four now on the road and at least several in bits.

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