I have two questions now that the machine shop has returned the head from my
'76 TR6:
1) what color should I paint the head. Seems to me gloss black.
Hole in one!
2) I will add the auxiliary oil feed to the head but received no
instructions. Where/how are the connections?
>From the oil pressure switch 'T' piece (which you'll have to obtain) to the
back of the head.
However, if your head has been properly cleaned after machining and the
rocker pedestals, shaft and oil drains in the shaft and rockers themselves
are clear of accumulated sludge, you really don't need an auxiliary feed.
Standard-Triumph valve gear only needs a continuous 'ooze' of oil and not,
contrary to widely held opinion, a 'semi-pressurised' oil feed. I asked the
following question only last year of David Eley, the engine's designer who
is now well into his nineties and as charming and polite as ever.
"Mr. Eley. Many enthusiasts seem to favour the fitting of an auxiliary oil
feed to the cylinder head on your four and six cylinder engines. Would you
like to comment?"
His reply was as follows: "John, if I had felt an additional oil supply to
the valve gear was necessary, I would have ensured a direct pressure feed
from the pump. The only two ways the existing supply can suffer is from
partially or fully sludge blocked oil ways within the valve gear itself, or
worn grooves on the back end of the camshaft. If the pump is working as it
should and the camshaft in good condition, then the internal supply will be
more than sufficient. A reliable check is to leave the engine idling for no
more than five minutes with the rocker cover removed. If flecks of oil are
found on the surrounding panelwork, the oil supply is performing as it
should, as designed and needs no further intervention."
"May I quote you on that?"
"By all means. Please convey to your friends that my four and six cylinder
engines do not need an additional oil supply of the type you suggest. In
fact, there is a danger that an excess feed to the top end could reduce the
oil level that *is* needed in the sump."
Draw your own conclusions.
Jonmac
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