crankcase seal missing a part?

[lawnboywillneverdie]

my lawnboy from the previous thread had a stuck collar but it finally came off. thing ids that i found the lower crankcase seal was not pushed up in the crankcase it was about to fall out. isn't something supposed to hold it in place? in the pic you can see it just above the pulley look really hard.

 

[Rivets]

99% of all small engine seals are press fit, with no other retainers.

 

[Flintmotorsports]

all the engine I have seen and that is a lot they all had a metal ring that is built into the seal that is why you have to put it in with a
steel plate of a flat rubber mallet to seat it flush with the oil pan.

 

[LB8210]

See prior post.

 

[Phototone]

The seal is a very tight fight normally, either the plastic body or steel body seal varieties. One possible reason for a seal that is loose is a cracked crankcase. The crankcase is split in the middle on "F" and "V" engines. It is possible, as I have done it, to hit such a rock as to crack the crankcase. If it is the "cap" that holds the reeds and provides the mount for the carb, you can just replace that, but if it is the part of the crankcase that has the cylinder cast on it, then best to just find a salvage motor.

 

[reynoldston]

Seal is press fit. You can put a sealant on the seal where it presses in the case will help hold it in place. If the seal is loose in the case I would use something like JB weld to hold in place.

 

[Phototone]

Seal is press fit. You can put a sealant on the seal where it presses in the case will help hold it in place. If the seal is loose in the case I would use something like JB weld to hold in place.

The seal is a consumable part, just like the spark plug or eventually the rings in the cylinder. I WOULD NOT ever use a permanent "glue" like JB Weld. A properly sized crankshaft seal is supposed to be a tight press fit. It will not come out under normal engine operation. If your seal is loose, it is bad. If a new seal isn't a tight press fit (with a tool), then there is something else wrong with your crankcase.

 

[reynoldston]

The seal is a consumable part, just like the spark plug or eventually the rings in the cylinder. I WOULD NOT ever use a permanent "glue" like JB Weld. A properly sized crankshaft seal is supposed to be a tight press fit. It will not come out under normal engine operation. If your seal is loose, it is bad. If a new seal isn't a tight press fit (with a tool), then there is something else wrong with your crankcase.

Yes I agree with you 100%. I Have put many seals in in my life time. I know what you are saying about it being a press fit. If it is a type of job where the seal wouldn't 't stay in the housing tight anymore because of maybe a bearing went bad and did a lot of damage. Now you are at a point to replace the housing, case, what ever you are working on or work with what you have. I have been at this point in time the customer just doesn't want to spend the big $$$. JB weld is just riggen type fix but will work for loose bearings and seals if need be. This will work also for something that you can't buy a replacement part for anymore. Now to put a sealant on a seals out side surface before you install it is a proper thing to do and you will find a lot of seals come with sealant on them right from the factory. Also you want to put some light grease on the inner rubber lip.