[TR] TR4A Aluminium Head

Frank Fisher yellowtr3 at yahoo.com
Tue Apr 4 09:53:52 MDT 2017


wow. a performance package.i would not think over-torquing it would be a huge problem.i think you mean compression is 150 to 155. no?ah screw..thermodynamics. so there is a delay in heat transfer from the explosion, to the head and block, to the water and then to the radiator. so when you come off the freeway you have a delay in cooling. also heat transfer is slower the closer to each different material is to each other. ie water at 100 head at 110 will move the heat pressure slower than water at 100 head at 200.so need to move the water quicker from the head to the radiator. the thermostat is supposed to control that. is your thermostat OK? if it is try drilling 4 or 6 holes around its perimeter.copper head gasket is OK for aluminum head. and undamaged tells me its needing to get the water from the head to the radiator quicker.not sure about the magnaflux. never had an aluminum head to know. but i dont see any reason whet it would not apply.so no water in the oil and head gasket ok...must be need for speedy movement of water.
try running without a thermostat.if thats good try the drill hole thinghave the radiator flow checked.then go to a bloody great electric fanthen try a high volume water pump.



      From: Bill Beecher <bill_beecher at flash.net>
 To: 'Triumphs' <triumphs at autox.team.net> 
 Sent: Tuesday, April 4, 2017 12:13 AM
 Subject: [TR] TR4A Aluminium Head
   
<!--#yiv6252018063 _filtered #yiv6252018063 {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv6252018063 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv6252018063 #yiv6252018063 p.yiv6252018063MsoNormal, #yiv6252018063 li.yiv6252018063MsoNormal, #yiv6252018063 div.yiv6252018063MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;}#yiv6252018063 a:link, #yiv6252018063 span.yiv6252018063MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv6252018063 a:visited, #yiv6252018063 span.yiv6252018063MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv6252018063 span.yiv6252018063EmailStyle17 {font-family:"Calibri", sans-serif;color:windowtext;}#yiv6252018063 .yiv6252018063MsoChpDefault {font-family:"Calibri", sans-serif;} _filtered #yiv6252018063 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv6252018063 div.yiv6252018063WordSection1 {}-->Happy Monday List,  Have had a problem with some water up in the rocker area of the TR3(TR4A Motor) ever since I bought it last year.  Just now getting to a point where I can pull the head and see if I can see what the issue is.  Below are my observations:1. Did not know it was an aluminum head until today, re-torqued it last year when I first saw this problem at 95lbs.  Learned today it should be 70lbs.2. Runs great, compression checks out good at 150-55 across all.  But after getting up to highway speeds then coming back to town it quickly overheats and blows the water past the rad cap.3. Cannot see any damage to the solid copper head gasket.  Is this the right type gasket for an aluminum head?4. Cannot see any damage to the head, how do you check an aluminum head?  I would think that magnaflux would not work here.5. Drained and checked the oil last fall, no water present in the case.  Any suggestions from the collective wisdom would be greatly appreciated, seems this motor was intended for some level of performance as it also has Moss’s roller rockers.   Many thinks to all,  Bill BTS30800L        
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