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As an engine wears, the clearance between the valve stem and guide increases; as this gets beyond tolerances the car will tend to smoke under deceleration (when you take your foot off the gas). Good valve stem seals will allow for greater wear before the smoke becomes intolerable. These late-model seals actually have little springs around them to aid in the effort. It is possible, although tedious, to replace them without removing the cylinder head. Will also fit the Sprite, MG Midget, and Morris Minor.

Valve Stem Seal Cup-type with Spring | Classic Mini | Sprite & MG Midget | Morris Minor

Valve Stem Seal Cup-type with Spring | Classic Mini | Sprite & MG Midget | Morris Minor

Valve Stem Seal Cup-type with Spring | Classic Mini | Sprite & MG Midget | Morris Minor
Part No: ADU4905
$1.13
Qty:
Fits the following:
Classic Mini
Sprite & MG Midget
Morris Minor
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Alternate Products
Valve Stem Seal Cup-type with Spring Value Line | Classic Mini | Sprite & MG Midget | Morris Minor
$0.48 Valve Stem Seal Cup-type with Spring Value Line | Classic Mini | Sprite & MG Midget | Morris Minor
Valve Stem Seal Late MPi-type Viton | Classic Mini | Sprite & MG Midget | Morris Minor
$3.03 Valve Stem Seal Late MPi-type Viton | Classic Mini | Sprite & MG Midget | Morris Minor

As an engine wears, the clearance between the valve stem and guide increases; as this gets beyond tolerances the car will tend to smoke under deceleration (when you take your foot off the gas). Good valve stem seals will allow for greater wear before the smoke becomes intolerable. These late-model seals actually have little springs around them to aid in the effort. It is possible, although tedious, to replace them without removing the cylinder head. Will also fit the Sprite, MG Midget, and Morris Minor.

 
 
Question:
Can you supply dimensions? ID of hole OD of seal unit H of seal unit
Answer:
The ID of the valve stem hole is .266". The seal OD is about .550" - the height is .435".
 
 
 
 
Question:
I rebuilding a 12G295 head with dual springs on my Classic Mini. Can you recommend which valve seals to use?
Answer:
These: https://www.minimania.com/part/ADU4905/Classic-Austin-Mini-Cylinder-Head-Valve-Stem-Seal

Those should work and are better than the little o-ring seals.

Mini Mania Tech Team

The Classic Mini Parts and Accessories Experts

 
 
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