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Engine Valve Guides


Best Answer Moke Spider , 13 January 2020 - 04:33 AM

If they are not fitted deep enough, the Spring Cap can contact them, usually resulting in a bent Push Rod and / or a Broken Rocker.

 

If the Umbrella type seals are fitted and the Cap - just - makes contact with the Guide, it will cut the seal.

 

If running a non-standard Cam and / or High Lift Rockers, this becomes more critical.

 

If the Guides are fitted too deep, you can expect short guide life and reduced flow through the Ports. There's also a risk of the Exhaust Valves picking up in them too, maybe resulting in a seized Valve. Also, if using Umbrella type Seals, you can expect them to not stay put.

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#1 Findrake

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Posted 13 January 2020 - 12:49 AM

Manuals all stress the importance of the valve guides being inserted to the correct 'depth'. How critical is this depth and what does a valve guide a few millimeters shy or deeper affect?



#2 Moke Spider

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Posted 13 January 2020 - 04:33 AM   Best Answer

If they are not fitted deep enough, the Spring Cap can contact them, usually resulting in a bent Push Rod and / or a Broken Rocker.

 

If the Umbrella type seals are fitted and the Cap - just - makes contact with the Guide, it will cut the seal.

 

If running a non-standard Cam and / or High Lift Rockers, this becomes more critical.

 

If the Guides are fitted too deep, you can expect short guide life and reduced flow through the Ports. There's also a risk of the Exhaust Valves picking up in them too, maybe resulting in a seized Valve. Also, if using Umbrella type Seals, you can expect them to not stay put.






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