Were not 3B engines just TR4 engines?
On 10-May-06, at 8:01 AM, Triumphs@Autox.team.net daily digest wrote:
> Date: Tue, 9 May 2006 09:13:49 EDT
> From: TR250Driver@aol.com
> Subject: [TR] 3B Head
>
> Guys,
> It was kind of interesting to look into the heart of the 3B motor.
> #1 piston
> was a whole lot cleaner the rest and actually a little shiny on
> top. The
> rest were all carboned up. The cylinder walls look fine. The head
> itself looked
> OK but #1 exhaust valve could be rocked back and forth a lot by
> grabbing the
> spring which could be spun around too. The rest varied in degree
> of movement.
> I am going to say that the valve guides are worn and that may be
> the source
> of the compression problem. Certainly in #1. Probably going on for
> a while
> now.
>
> I wondered why the dang thing was so hard to tune. I recall
> adjusting the
> valves one time and going back 10 miles later only to find they had
> all changed.
> It is amazing that it ran as well as it did. This may explain why
> the oil
> turned black after a few hundred miles? I am actually happy that
> it finally
> went south enough so I know what to fix.
>
> I am hoping the Head can be rebuilt, but this will be the second
> time. It
> must have been poorly done the first time since that was only less
> than 20,000
> miles ago. That is what threw me a curve and I did not suspect a
> problem with
> the head. I am told that rebuildable Heads for our TRactor motors
> are becoming
> harder and harder to find. Another 3B head would most likely be in
> the
> unobtainium category.
>
> Fingers Crossed,
> Darrell
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