speed six valve clearances
Discussion
hi all, just got the cover off to check clearances before doing service and all exhaust valve clearances are around .013 thou. sure i've seen somewhere that exhaust should be .008 to.012 and inlets .006 to .008 can anyone confirm if these figures are correct? as i might as well do them all while i've got the top off..tia phil
Taken from a SP6 cerbera service guide
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TVR services are to be done every 6000 miles or every 12mths which ever comes first they use 10w40 moblie fully sythetic.
Tappet adjustment
To do the tappets
1. Remove the top cover all sparkplugs and camshaft cover.
2. Push rags into the plug holes just so nothing can be dropped into the bore, the rear of the head has a large oil way on the exhaust side at the end of the cam by the bulk head you have to put a rag in there also just in case a shim drops if you do the engine will have to be stripped so be careful.
3. Measure the gaps,
• Inlet is 5-7thou gap
• Outlet is 10-12thou gap,
To measure them turn the engine by a rachet or spanner until the cam lobe at its top of its lift is pointing up at you the valve should be fully closed measure each gap on all.
It is best that you make a table on paper with each valve having three boxes so you can write down the results eg inlet v1
box 1 6thou
box 2 size for shim
box 3 size of shim needed
If the back ones are more than 2thou more than max do them if not leave alone.
If the gap of the valve is to small eg 3thou then the shim needs to be smaller than the original shim to get the shim out you have to use a small bar or bent screwdriver compress the valve spring get a magnet to get the shim from the collet and repeat this on each one that is out. If the gap is to big eg 8thou then the shim needs to be bigger than the original shim.
eg shim size 294thou the needed shim would be 296thou to close the gap to 6thou .
Just be careful do not drop any thing if you do make sure you get it back you cant just take off the sump it is a full strip down to remove it as all the timing chains have to come off.
***********
TVR services are to be done every 6000 miles or every 12mths which ever comes first they use 10w40 moblie fully sythetic.
Tappet adjustment
To do the tappets
1. Remove the top cover all sparkplugs and camshaft cover.
2. Push rags into the plug holes just so nothing can be dropped into the bore, the rear of the head has a large oil way on the exhaust side at the end of the cam by the bulk head you have to put a rag in there also just in case a shim drops if you do the engine will have to be stripped so be careful.
3. Measure the gaps,
• Inlet is 5-7thou gap
• Outlet is 10-12thou gap,
To measure them turn the engine by a rachet or spanner until the cam lobe at its top of its lift is pointing up at you the valve should be fully closed measure each gap on all.
It is best that you make a table on paper with each valve having three boxes so you can write down the results eg inlet v1
box 1 6thou
box 2 size for shim
box 3 size of shim needed
If the back ones are more than 2thou more than max do them if not leave alone.
If the gap of the valve is to small eg 3thou then the shim needs to be smaller than the original shim to get the shim out you have to use a small bar or bent screwdriver compress the valve spring get a magnet to get the shim from the collet and repeat this on each one that is out. If the gap is to big eg 8thou then the shim needs to be bigger than the original shim.
eg shim size 294thou the needed shim would be 296thou to close the gap to 6thou .
Just be careful do not drop any thing if you do make sure you get it back you cant just take off the sump it is a full strip down to remove it as all the timing chains have to come off.
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