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DanielH

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Posts posted by DanielH

  2. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Hi there,

    I had a closer look at the shells over the weekend...

    The caps and rods are not mixed up, they all have figures (1-6) which line up properly.

    I guess the problem is with the shells:

    I placed them on a flat surface (mirror) and noticed, that some of them are bent: see foto below.

    The old shells are perfectly flat at the edges: see foto below.

    Some shells are only slightly bent, i.e. when I screw caps and rods together, I am able to correct the misalignment by providing a bit lateral pressure until the bolts are fully fastened.

    I am now returning the set of shells to Rimmerbros and get a different one from somewhere else.

    Any recommendations for a good source?

    thank you 🙂

    Dan

    Capture.JPG

    Capture.JPG

  5. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Hello,

    I just want a standard rebuild, without frills.

    Cylinder bores

    The cylinders have been bored to match +0.020 oversize pistons. 

    I purchased the "county" pistons from rimmerbr0s: https://rimmerbros.com/Item--i-149976020COUNTY

    I was unable to find information about the manufacturer etc. Rimmer wrote:

    "This is the Hepolite page, our CP800 is a reverse engineering 19270.  The spec would be 020 on top of this.

     The piston to bore clearance on this piston is 0.002-0.00252"

    Main bearings

    All the journals were in spec but some showed marks like this one: see attached.

    Grinded to fit +0.010 oversize bearings from Glyco:

    https://rimmerbros.com/Item--i-144194010

    Big end bearings

    Grinded to fit +0.010 oversize bearings from Glyco:

    https://rimmerbros.com/Item--i-RTC1751010

    lager 1.png

  6. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Hi there, long time lurker here...I found this forum really helpful sofar, so i decided i would ask you guys to guide me during my first engine rebuild. So I am planning to post the various project stages here and I hope you could help me out with your informed crowd wisdom 😉 

    I am not new to mechanical work on pre-70ies Jaguars and Triumphs, but this my first engine rebuild.

    Engine number is KD56475 E

    Current stage is: engine returned from machinist.

    So, I am looking forward your input!

    thanks

    Dan

     

    status7.JPG

  8. GT6 mk2: piston clearance for 0.02 oversize bore

    in Engine

    Posted

    Hi there,

    my assumption is, that the County pistons are rather common in Triumph engine rebuild projects. Am I right?

    That manufacturer appears to be really opaque...no data, no address, even not in the parcel.

    How do your machinists cope with that? Do they look at the pistons and say: thats cast, so I go with the rule of thumb: clearance is 1% of dia??

    Any thoughts?

    Thank you 🙂

    Daniel

     

  11. GT6 mk2: piston clearance for 0.02 oversize bore

    in Engine

    Posted · Edited by DanielH
    wrong info from vizard provided! changed the reference to pp 11.

    Hi there,

    my machinist is asking which clearance for the block bore he should account for?
    He is saying that the clearance depends on the particular make of the piston, which makes sense to me.

    I've provided him with the +20thou pistons from County:

    https://rimmerbros.com/Item--i-149976020COUNTY

    The County parts number is 149976.

    I am unable to get a datasheet from either Rimmerbros or from the manufacturer even.

    What's written in the books?

    1. The handbook says (pp 42):
    Pistons are available 0.02 (0.508 mm) oversize. 
    Before fitting, the cylinder block should
    be rebored to 2.9614/2.9609 (73.685/73.683mm) to suit the oversize pistons,
    Piston dia: 2.937+0.02 (74.600+0,508mm) = 2.957 (75.1078mm)

    2. Vizard says (pp 11):

    In the standard bores the pistons are graded in three different sizes and the bore clearance on a new engine will be between 3.5 thou and 4.2 thou (0.0035-0.0042).

    Any thoughts?

    thanks
    Daniel

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