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1927 DB Hogs Head Install - HELP


fsnooks

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On the my 27 DB, with separate Starter on the flywheel, does the Bell Housing install to the back of the yoke or thru the front.

See attached yoke and clutch cover assembly.

post-56599-143141771752_thumb.jpg

The Bell Housing assembly can be installed from the front where it will be between the engine and yoke or installed on the back side so that the yoke is between the engine and the clutch assembly.

When I dismantled it, it was installed thru the front but a Parts list diagram shows it installed on the rear.

I think maybe is was installed incorrectly on mine. It doesn't make sense to have to remove the engine to get the tranny off when it installs from the front.

Can someone send me a picture of how theirs is installed? Engine/yoke support/bell housing.

post-56599-143141771707_thumb.jpg

post-56599-143141771731_thumb.jpg

Edited by fsnooks (see edit history)
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Is the "hogs head" to which you refer what I would recognise as the bell housing?

I see your point about trapping the transmission so that the engine would need to be removed to faciliate it's separation and the attraction of arranging the yoke so that the engine removal problem can be avoided. The latter seems correct because one thing you may consider is the correct prop. shaft to rear axle measurement. Just an idea I had to avoid problems later.

Besides, I shouldn't want to remove the engine to replace the clutch if I could help it!

Ray.

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Is the "hogs head" to which you refer what I would recognise as the bell housing?

I see your point about trapping the transmission so that the engine would need to be removed to faciliate it's separation and the attraction of arranging the yoke so that the engine removal problem can be avoided. The latter seems correct because one thing you may consider is the correct prop. shaft to rear axle measurement. Just an idea I had to avoid problems later.

Besides, I shouldn't want to remove the engine to replace the clutch if I could help it!

Ray.

Yes you are correct. "Bell Housing".

What engine/yoke/bell housing setup do you have?

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The bell housing goes behind the rear engine mount cum X member

Ron,

To clarify, the Bell Housing is bolted to the back side of the engine mount and the engine is bolted to the front side? This would allow the bell housing to be removed from the back and "not" have to remove the engine?

Fred

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fsnooks.... I simply had to have a look on my car. The engine mount prevents the bell housing from being removed with the engine mounting in place. I assume that the engine would need to be supported and the mounting/cross member be un bolted and withdrawn with the transmission. No need to remove the engine.

I would look very carefully before bolting the tranny to the rear of the engine mounting. There may be a risk of the bell housing failing around the bolt holes if it's flange is not supported by clamping pressure. I don't know if there are other issues to consider but I guess it is designed like this for a reason.

Ray.

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  • 4 months later...
Guest Jeffholderman

I just had the same issue on a 25 BS the housing was through the frame brace from the front, i shall reinstall it the same way but seems backwards..... does anyones mount differently?

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I have a Mechanics Instruction Manual (1914-1927) and under the Engine section subheading Supports-Engine it states, prior to A875-380 the pressed steel rear engine support was placed behind the transmission (aft face of the bell housing) because the machined surface of the engine block and the machined forward face of the bell housing provide better alignment of clutch and transmission by bringing the two machined surfaces together. If your were to install the rear engine support between the engine block and the bellhousing in the case of a multi disc clutch I am sure you would end up with excessive fore and aft movement of the clutch assembly.

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  • 11 years later...

I know this is an old thread but I am looking at putting an engine and gearbox in a car and this diagram is in my Master Parts List 9th edition February 1927.

 

IMG_2459.jpeg.91190aff96b5dbca8e9583b3080d1a04.jpeg

Definitely sandwiched between the engine and gear box. 

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My copy of the parts book shows an illustration of the support/yoke on the back side of the bell housing with the multi disk clutch in the clutch section, think it is on page 170. 

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Thanks Mark, I think I was right to regenerate this. My book on page 170 showing the multi plate clutch in the bell housing has the diagram shown here with the rear engine mount subframe behind the bell housing flange, exactly as you say.

My picture was from page 357, showing the opposite. Most confusing. 

 

IMG_2460.jpeg.1cc1d93964abdedc45b98360f4d85f17.jpeg

 

I note “Bob Down under” makes the point that the gap distance between the nose of the multi-plate clutch and the seat at the rear will perhaps affect the clutch movement (operation). The multi-plate clutch was used right up to and including the “C” motor in late 1926. I will measure this gap and report back.

 

Another point I have is that there are two locating dowels on the rear of the engine block

 

IMG_2464.jpeg.0e8b336cc54bc29b5b4f56464076fd0e.jpeg

 

and matching notches in the engine mount subframe for both early and late cars. Notches not holes.
 

IMG_2461.jpeg.323eb57f5fda65b072f2c10445d56d43.jpeg

 

The bell-housing  has holes.


IMG_2462.jpeg.078c7a4a40b5244f21333ec9c79da3af.jpeg

 

This leads me to believe that these notches are there to locate the engine mount subframe to the block with room for alignment side to side while supporting the engine before installing the gearbox.

If the gearbox is fitted to the block first then you really need the body off to be able to install this as a unit.

Anyone with any further thoughts please?

 

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     My guess is that the alignment between the engine and bell housing is more critical than that of the engine mounts so they made the dowel holes exact and skipped precision on the engine mount.  With round holes for the bolts, the slots wouldn't offer much adjustment.

     Just a guess.

 

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On 7/22/2013 at 8:51 PM, Bob Downunder said:

I have a Mechanics Instruction Manual (1914-1927) and under the Engine section subheading Supports-Engine it states, prior to A875-380 the pressed steel rear engine support was placed behind the transmission (aft face of the bell housing) because the machined surface of the engine block and the machined forward face of the bell housing provide better alignment of clutch and transmission by bringing the two machined surfaces together. If your were to install the rear engine support between the engine block and the bellhousing in the case of a multi disc clutch I am sure you would end up with excessive fore and aft movement of the clutch assembly.

I feel that the above quote from Bob is correct and his reasoning is sound, behind the gearbox it is.

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