engine specs

pmlmbigpondcom

G'day All

In relation to a 1937 8 cylinder splashie, I am looking for the following specs

Torque settings for say, big ends, main caps and anything else important

Bearing tolerances for white metal mains and big ends, ie clearances

thanks

Phil Macwhirter
Australia

Uncle Josh

Go to http://www.hetclub.org/

Sign in

Scroll to lower right of website

Find Alex Burr's online literature

Look for 30-39

Manuals 30-39

Mechanical procedure manual 34-37

download PDF

More than you need to know there

pmlmbigpondcom

Thx Uncle Josh
I actually have that manual and note that the clearances are listed as 1 thou - seems a bit tight and wonder what others use.
DG's for other brands of engine mention 1 to 15 thou which sounded like a wide range

can cold thick oil find it's way into a 1 thou gap ?

Nothing about torque in the manual though

Thx

phil

Molin

You can find anything here http://hudsonterraplane.com/tech/tech_index.htm
I am rebuliding one!

pmlmbigpondcom

Thanks Molin

I didn't see anything more comprehensive on my required subject at that website

I actually want to know what current engine builders are doing with bearings and torquing up

Phil

Molin

Se files  the torque crankshaft 75lbs conrods 40lbs

Nerve_Center

Phil,

If you can get hold of a Railton workshop manual, they (the English Club) re-wrote the Hudson Manual to include all the torque settings and more detailed information. The English are rather particular about having everything written down so good old engineering knowledge isn't needed. The Railton Club have it available online if you are a member I'm told.

Ric West IN

1/2 to 1 and 1/2 thousandths.  on splasher engines. Any looser will greatly shorten the service life.  

Uncle Josh

I use aluminum foil to check the bearings.  Light duty is .0007 and heavy duty is .0014.  If the bearing is tight with a .0014 strip and loose without it, you're there.  A shim on one side of the cap with give you 1/2 the shim thickness adjustment.  Do one bearing at a time.

Use 15W40 oil in the splasher for summer driving, and make sure the upper pan is full.  You can either fill it and attach the pans from underneath, or get the pans on and put your oil in the valve gallery before the valve covers go on.  That will fill your oil troughs, and run over into the sump.

the shop service manual for 48-52 has a complete torque chart in the back.

Molin

Just buy plastiguage to see the right clearence

allan

Don't forget when using plastiguage you are not going to match the clearance in the book.  Plastiguage gives you total clearance, the book is a radial clearance, so half your plastiguage reading for comparing your actual clearance to the spec.  And, don't forget if your oil is too cold you will need to match your oil weight with the weight specified in the manual as well.

Uncle Josh

If you use plastigage, make sure it's real fresh.  The older it gets, the harder it gets and will push it's way into the soft babbitt and give you a false reading.

Frankvintagefullflowcom

Interesting........As an FYI, my '42-'47 MPM gives a spec for radial main bearing clearance as .0005" to .0015 (pg 82) whereas the text regarding crankshaft main bearings (pg 94) says to maintain a diametral  clearance of .0005"-.0011", emphasizing the importance of staying within that spec. Interesting that the book contradicts itself.....but not too surprising.

Frank   

pmlmbigpondcom

So.... we have wide range of clearances for the bearings
I take from all of this and some other comments / messages that most seem to set at 1.5 to 2.5 thou total clearance The range though - up to 15 thou seems extraordinary.

I think we'll go for 1 thou per side, say 2 thou overall

Now about to start full engine rebuild on an engine which was fully rebuilt less than one thousand miles ago.  Insufficient ring and piston clearance, badly honed bores, scuffed! pistons, aluminium through the white metal bearings, the list goes on
At least I have "settled" with the person who did the faulty work so I will only be a few thousand dollars out of pocket.

Thanks for all of the replies.

Phil