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MG MGB Technical - flywheel question

I am reinstalling the flywheel in my 75 b and the manual states there are alignment marks on the crank. There are two dowels on each side of the crank for the flywheel to fit over and it will fit over these dowels one way or 180 degrees the other way . I cant find marks for alignment marks on either the crank end or the flywheel. Am I missing something or does it go on either way? As usual any replies are sure appreciated. Cant imagine what I would do without all the help and information on this site. Thanks
kra Karl

Look on the edge of the wheel near the ring gear - opposite one of the two dowel holes will be 1/4 - this is the marker for TDC on cylinders 1 & 4 - set the crank at TDC 1 and put the marks on the wheel at the top.
Chris at Octarine Services

My Haynes manual says:
"When refitting the flywheel, ensure that the 1/4 timing mark on the periphery is at the top when the numbers 1 & 4 pistons are at TDC. Note: The depression in the crankshaft flange face has a mark like the one on the flywheel periphery, and these marks should be in line."
I thought this might help but I've just been to have a look at my flywheel, which is still on the engine, and can't see any makings on the clutch side, nor on the rim. Unless they are on the engine side or under the cluth I am lost as you! I still have the clutch attached so I can't get to the crankshaft flange either. Someone will know!!!
Richard
Richard Coombs

Chris There are no markings on the flywheel. But I think I see what you mean. There are several bolt holes on the flywheel. There are a group of three close together on one side and another group of three 180 degrees on the other side. The center hole on each side goes on the dowel on the crank. With 1 and 4 in top dead center, the center hole of the set of three that has holes drilled on the oppsite side up by the ring gear is to face up. (I know this is very confusing) I think this is the was it goes on . In the absence of marks.
Richard Thanks for responding. The confusing explaination above is the only thing I can think of that will give me an orientation. Thanks guys
kra Karl

Karl. I have examined a number of MGB flywheels. All of them have the 1/4 mark on them, but it is often obscured by light rust. Clean the flywheel using some steel wool or a ScotchBrite pad and you should find the markings. The flywheel should be installed with the 1/4 mark on top when the crankshaft is oriented so that pistons one and four are at the top of their travel.

Les
Les Bengtson

1977 MGBGT
Could some one please tell me whether the rubber weather seal (on the outside of the wind up window glass) is rivetted to the chrome finisher which is fixed to the door top or glued. My finishers have no rivet holes other that those lower down for attachment to the door top.
The exploded drawings in the Moss catalogue show rivets for their attachment!
Many thanks
Peter M
Peter M (Member)

1977 MGBGT
Whoops - sorry - meant to start a new thread.
Peter M
Peter M (Member)

Peter,

Neither - they are clipped!
Chris at Octarine Services

Les I am sure you are correct. However this flywheel has been refaced and lightened. I did find a small pencil mark on the backside at what I think is the proper place. I think the dowel holes on the backside also are there to determine orientation. I am thinking about etching a small mark in this spot for future reference. Thanks, KARL
kra Karl

kra
The1/4 marking is on the outside edge right next to the ringgear, on the engine side of the ringgear from memory. It or some part of it would most likely still be there. Willy
WilliamRevit

On the early flywheel it is on the engine side of the ring gear.
Chris at Octarine Services

Here is a photo -

Chris at Octarine Services

and on the late flywheels it is on the clutch side of the ring gear - photo -

Chris at Octarine Services

Chris,
There were three flywheels, one for the 18G/GA engines and one for the 18GB engine. Both of them were 10 3/4 inch. There was also a 11 1/2 inch flywheel for all of the subsequent engines. Do you classify the one for the 18GB engine as an "Early" or a "Late" flywheel?
Tom Mullins

Early - the 10 3/4 inch ones fitted for the inertia starter motors. 18G, GA, GB.

Late - the 11 1/2 inch ones fitted for the pre engaged starter motors. 18GD - 18V
Chris at Octarine Services

This thread was discussed between 21/03/2009 and 23/03/2009

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