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TR2/3/3A Cylinder head threaded plub

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Redoakboo

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I am in the final stages of the restoration of my 54 TR-2. I cranked the engine for the first time. It ran O.K. but oil was flowing out a treaded hole in the rear of the head. It is obvious that something screws into this hole to keep it from flowing out? Is this just a treaded plug I forgot to install? Or does something else, oil related, go into this hole?

Dick
 
charleyf

charleyf

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Assuming that the TR2 and TR3 are the same. If the hole is on the driver's side it takes a bolt with a copper washer. This is a hole that opens to the galley where the oil to the rockers comes up from the cam below.
 
TomMull

TomMull

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Charlie's right. It's a 3/8 nc bolt and 3/8 inches long. If you can't find one that short, you could cut one. Make sure the threads go all the way to the bolt head. The washer is quite thick too. Perhaps double up if you can't find a thick one.
Tom
 
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Redoakboo

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Thanks Guys,

Missed it in the re-assembly. Good pressure as it vomited out about 1 qt of oil in several minutes! So all the bolt does it stop up the hole?

Couldn't find it either in the Moss or RF catalogs. Off the NAPA.

Dick
 
TomMull

TomMull

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Yup. Rimmer Bros. have it in their catalog but out of stock. Tom
 
2

2liter4cyl

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The only reason for the hole in the head is to cross drill a connection to the rocker arm pedestal oil hole. The wrench is a box end 14mm or 9/16".

It is cast at an outboard angle.

LeT
 
charleyf

charleyf

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It is usable as an alternate way to get oil to the rocker. There are aftermarket kits that have a line from the oil gallery along the cam line that tie into this hole. I have had to use this as I believe the shop that placed my rear cam bearing did not correctly line up the hole for the rocker oil flow. So in place of a tear down I installed the bypass line. But beware of using that the way it comes. I got so much more oil up there that I had to weld the orfice hole in the kit shut and drill it much smaller like under 1/16".
 
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