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DanielH

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Posts posted by DanielH

  1. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    I am planning to insert the valve guides into the cylinder head tomorrow.

    Question: the new guides have different lengths:

    * short: 2,031"

    * long: 2,256"

    Which are for the exhaust valves, which for the intake valves?

    I am planning to use our household oven while the wife is away, to heat up the cyl. head.

    Is there anything I should know before I press them into the bores?

    thanks again 🙂

  2. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Good evening 🙂

    just a quick update.

    The new "blue printed" oil pump has arrived, all clearances are really tight!

    image.thumb.png.f67ddf7e962cec56972bdfde49bb4a92.png

     

    Installed the piston rings per the guide. Arranged them in their grooves in such a way that they are in different sectors.

    image.thumb.png.a689610663ff17499b2ae8f0d0694048.png

     

     

    image.thumb.png.13e58d66cc82aa0816158a2ac26792a1.png

    Tightening everything down per the handbook.

    image.thumb.png.ee395f1381ed0eaf526e7af0d73ddf3b.png

     

    For my ease of mind I applied some locking paint:

    image.thumb.png.89caca24d071d893c2667a65eb892f09.png

     

  7. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Good evening 🙂

    I've got a couple of questions regarding the piston rings.

    a) Order

    the country pistons come with 3 grooves, which I am counting from the _top_ 1, 2, 3.

    • 1 and 2 take the compressions rings
    • 3 takes the oil ring triples.

    I can easily identify the order and orientation of the oil ring triples (I hope so...)

    I find the rings for grooves 1 and 2 problematic, because the don't have a TOP mark, only a part number is echted.

    Groove 1: the ring which is supposed to go into this groove has the chamfer INSIDE-TOP

    Groove 2: the ring has the chamfer on the OUTSIDE - BOTTOM

     Is the order and orientation correct??

    b) Gap

    I've measured these gaps:

    • 1, 2 groove/ring (compression): 0,20-0,25mm
    • 3 groove/ring (oil): 0,25mm (the curled oil ring was impossible to measure...)

    The manufacturer specs says (for 75mm bore??): 

    • 1, 2 groove/ring (compression): 0,25mm
    • 3 groove/ring (oil): 0,20mm

    So, am I on the safe side??

    greetings 🙂

    image.png

    image.png

    image.png

    image.png

    image.png

  9. Overhauling my O/D gearbox (GT6+)

    in Gearbox & Overdrive

    Posted

    Hi there, 

    you won't believe it, but it is true: my parcel containing the relined overdrive clutch is still stuck somewhere in the royal mail export pipeline between UK and Germany due to the security breach in early January 😞

    And guess what: the gentleman who dispatched the parts doesn't really bother. As a foreigner I cannot file a claim with RM. 

    It has been 4 weeks since David has dispatched my overdrive clutch. The tracking status has not changed since he dropped off the parcel at the post office there in Rugby.

    How would you deal with that?

    greetings

    Daniel

  10. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Evening!

    I've got a question regarding the engine's rear plate. When I took mine apart I noticed something strange: a pin was setting in the rear plate, and that pin gently pressed against the fly wheel. The foto below shows the pin and the wear mark on the rear side of the fly wheel. You can see that the face of the pin is blank and worn from the sliding surface of the fly wheel.

    The pin was somehow loose and just sat there in his hole.

    Anybody has got an idea what happened here?

    thanks 🙂

    image.thumb.png.0ed7704f5a1f3feb43b93a97befb4107.png

  14. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Evening,

    checked the main bearing clearance and end float today.

    Cleaned the surfaces, inserted the new main bearings, and 2 STD-size thrust washers, new main bearings and tightened the main bolts to spec.

    image.png.84d613be993b8da403f31f2053057a33.png

    End float was: 0,2mm (spec: 0,157-0,203mm)

    Replaced them with a STD (0,09")  and +5 (=0,095") thou thrust washer, which yielded this end float: 0,08mm

    Reduced the thickness slightly and achived an endplay of 0,160mm

    image.png.1167e50c47714da0e3a966b2873a8d01.png

    Resumed to check the bearing clearance.

    image.png.f5c891e1616604233cd9bae18ed01435.png

    Removed the bearing caps and inserted plastigauge and tightened the bearing caps down to spec.

    Resulting widths were ranging between 2.0 and 2.5thou, which is in spec.

    image.png.e2d41484217cf891334896b2dbd3f093.png

    image.png.2f5b550a1ecc8e81103b63a9e881453f.png

    If you guys won't come up with objections I'll get some proper assembly lube (was using WD40 for this task) and do the final assembly of the crankshaft.

    Greetings

     

  15. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Evening, 

    I was checking my crankshaft before fitting it again.

    Which of these grooves are from the front oil seal? Can I tolerate that or should I sand them out?

     

    image.png.83df0a6768844947f27183e4be36a53d.png

     

    Then I noticed these wear marks on the timing chain gear:

    image.png.edd8b3dd1cb46c68935abdfbf856b52e.png

    Is that ok? Or should I replace that?

    Thanks 🙂

    Daniel

     

  18. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Hi there,

    had a look at the oil pump today.

    The endplate looks ok, very few marks:

    image.png.d313ba1becd9658c746d4bcf49e79a73.png

    Took the 3 measurements per the handbook (in mm):

    1) clearance inner rotor <-> outer rotor: 0.25-0.30 (should be < 0.254)

    2) clearance other rotor <-> body: < 0.20 (should be < 0,254)

    3) clearance inner rotor <-> end plate: 0.20 (should be < 0.102) 

     

    image.thumb.png.ef99ff2fc16d63b1ca998f8f20faf4c8.png

     

    Soooo, it appears that this oil pump is worn out.

    Question: is the quality of the oil pumps from the "usual suspects" good enough? 

    thanks 🙂

    Daniel

     

  19. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Evening all,

    while I am still waiting for the Royal Mail to sort out their export service interruption, I had a look at my rocker shaft, that shows wear marks like this:

    image.thumb.png.52b488f5286e1792daab928ebba2b025.png

    I guess my rocker shaft is toast, as well, isn't it?

    Do you have recommendations for good replacements?

    thank you 🙂

    Daniel

     

     

  20. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Hi Mr Wagger 🙂 yeah right, the pistons on the foto are the old ones, the new ones are still in their boxes.

    >Your valve seats need re-cutting, looking at your pictures. As that will remove any absorbed lead, probably best to have the seats changed. Also check the valve guides for wear. Fit new guides before machining the valve seats. They must be concentric.

    ok, first the guides then the seats. I should get them from Chris Witor, right?

    thanks 🙂

  21. GT6 mk2: starting my engine rebuild

    in Engine

    Posted

    Hi there, while I am waiting for royalmail to resume export service, I am working on the engine.

    Apart from the engine stand and the black varnish, no progress was made.

    image.thumb.png.a35c94436362f78af36a95f7defd64bc.png

     

    image.thumb.png.79e2b98a9027ca496270e0a8647a282a.png

    The head was cleaned, no varnish yet, 

    image.thumb.png.6a181b7a7ef628478760ee087d0c0fe0.png

    image.thumb.png.394d03862b24e4a7d9e259af0cbf169a.png

    No cracks are visible. The valve seats have pits:

    image.thumb.png.4688f79ccbd2256ae98104be039cf001.png

    image.thumb.png.b6fa217d310c050867261d0f5fd8fd4d.png

     

    In terms of parts, currently I've got this:

    •  big end
      • pistons 

        1

        149976020COUNTY

        PISTON SET +20 FLAT TOP

      • main bearing shells
      • Small End Bush Kit - 6 - 119813K6
      • Timing Chain (single roller) - 105131 + tensioner

      • Big End Bearing Set - Oversize +0.010 - RTC1751010 - OEM - Glyco

        Main Bearing Set - Oversize +0.010 - Glacier - RTC1752010

        		           
      • NO new oilpump
    • head:
      • nothing

     

    I guess I want to assemble the big end first, and get the head prepared in parallel.

    Apart from cleaning the block, what should I do next?

    1. big end?
      1. install the main shells + crankshaft, measure the play/clearances
      2. order a new oil pump??
      3. check the connecting rods, bring to the same weight?
      4. ??
    2. head?
      1. get new valve seats? inlet and outlet? 
      2. order valve guides, valves etc?

    As you see, I've got no plan yet...any recommendations are wellcome 🙂

     

     

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