All,
The same kind of problem happened to me when renewing the head on my TR3-A.
After dismantling the whole job again I found out that the probelem was
caused by some pushrods not seating properly in the camfollowers, they were
somehow seating on the adge of the followers or on a ridge.
This could have been recified very easily by rotating them by hand and
easing them in the correct position.
Be careful when doing this and DO NOT pull on the pushrod because you could
have the follower sticking to it because of the cold oil and pulling the
follower out of position. You would then have it lying around in the engine
internals. This would probabaly lead to a LOT of further dismantling.
Good Luck!
Jan
-----Oorspronkelijk bericht-----
Van: Randall Young <randallyoung@earthlink.net>
Aan: 'Brian Sanborn' <sanborn@net1plus.com>; Triumph List
<triumphs@autox.team.net>
Datum: dinsdag 20 april 1999 3:35
Onderwerp: RE: TR4 Head - Serious Problem - Need Help!!!
>
>Brian :
>
>I'm pretty sure Ken Gillanders at BFE has shortened push rods in stock (he
>had mine). Call him at 626-443-0939, or email at BFEKENG@aol.com. He can
>probably have them to you by Wednesday (it's after 6PM here, so too late
>for FedEx tomorrow). Or check with Brian Schlorff at Performance British.
> Racers use shortened push rods all the time, so they should be easy to
>find.
>
>However, 1/16" should be within the normal range. My rockers have at least
>1/4" adjustment (at the valve) left. Something else is wrong, unless you
>also had the head ground. Before doing anything else, I would suggest
>pulling the head and checking the situation. If the exhaust seats really
>are too low, the head casting will act as a shroud, in effect reducing the
>valve opening.
>
>The hardened seats are definitely the way to go, and I'm sure the situation
>can be corrected. However, I sure understand the frustration of taking
>time off, and then not having the right parts !
>
>Randall
>
>On Monday, April 19, 1999 3:38 PM, Brian Sanborn
>[SMTP:sanborn@net1plus.com] wrote:
>>
>> Listers,
>>
>> Hit a big snag and need some serious help.
>>
>> I'm at a dead stop on the engine rebuild. I got the rocker shaft
>assembly
>> all together so I can set the timing of the cam. You have to use that
>> crazy procedure in the workshop manual. I installed the new push rods
>and
>> the rockers..... and big trouble. The camshaft would not move at all
>> after tightening down the rocker posts. I found that none of the exhaust
>> valves had any play at all.
>>
>> It turns out that the machine shop guy installed the hardened seats in
>such
>> a way that the top of the valve is now 1/16 inch higher that it use to
>> be.... 1/16 higher that the intakes. This takes out ALL of the
>adjustment
>> gap and actually pushes down on the valve a little with the cam in the
>> completely closed position.
>>
>> I called BPNW to see if they had any shorter pushrods... no dice. He
>did
>> have some advice..... his first thing is to complain to the machine shop
>> owner..... but the damage is done. He suggest a couple of things.... I
>> could grind 1/16 off the top of the exhaust valve stems, and/or grind
>some
>> meat off the bottom of the adjuster end of the rocker to great some
>play...
>> and/or shorten up the exhaust push rods by pulling the head off and
>cutting
>> down the shaft and pressing the head back in.
>>
>> This has me really bummed. I thought that I was doing the right thing
>by
>> having the valve inserts done. I have taken this week off to reassemble
>> the car and now I am stalled. The machine shop guy is on vacation in
>> Disneyland with his family and won't be back until Monday the 26th. But
>> unless he rips out the exhaust seats and redoes them... if that's
>> possible... I'm stuck. I could have my backup head done instead.... but
>> that has other problems.
>>
>> Anybody seen this problem before? Any advice is welcome
>>
>> Brian Sanborn
>> 62 TR4 CT16260L - Groton, MA
>> sanborn@net1plus.com
>>
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