Xmas6 Posted April 11 Report Share Posted April 11 Hi all - I'm admitting defeat and asking for help (this is akin to asking for directions) I've rebuilt the engine in my '6 and cannot get it to run properly, if it starts it farts and bangs and doesn't rev. properly. It has a new fuel pump and pressure regulator, the MU has been overhauled, reset and retimed and all the injectors appear to be functioning correctly and butterflys set Compressions are between 170 & 175psi. New plugs (N9YC) points, distributor cap & leads, coil and static timed to 11 deg. I've gone over it several times resetting and checking everything. The only thing I can think now is I've got the valve timing out by a tooth, is it possible that it will start and run very roughly this way or have I missed something?I'm Any help could make an old man very happy! Cheers Neil Quote Link to post Share on other sites
stuart Posted April 11 Report Share Posted April 11 Manifolds set level and synced? Stuart. Quote Link to post Share on other sites
Andy Moltu Posted April 11 Report Share Posted April 11 Given compression, cam timing likely to be OK. Being a tooth out probably not enough to make it spit and bang, merely move the power band up or down the rev range. Ignition timing - is that 11degrees btdc on the correct side of the distributor cam lobe? It's easy to put it at 11 after or rotate the dizzy the wrong way so you are on the closing ramp of the cam. Have you got the firing order correct? Butterflies mis-aligned butterflies or manifold air leak. Metering unit being mis-timed probably isn't enough to explain this. If injectors are spraying you probably have adequate fuel pressure but no harm in checking it. Fake plugs? **** condensor, cap or rotor arm? CP (3ohm) coil in a CR (1.5ohm) car? Quote Link to post Share on other sites
trchris Posted April 11 Report Share Posted April 11 Hi It sound like out of balance throttle bodies Chris Quote Link to post Share on other sites
Peter Cobbold Posted April 11 Report Share Posted April 11 My guess it its firing at 11 After TDC, as in Andy's post above. Especially if the farts and bangs are in the exhaust. Peter Quote Link to post Share on other sites
Mike C Posted April 11 Report Share Posted April 11 I'd check the timing with a timing light and see if it moves/disappears during the farts and bangs. Quote Link to post Share on other sites
JohnC Posted April 11 Report Share Posted April 11 Sounds to me like badly wrong timing. All the other suggestions here would certainly contribute to rough running, but not (I think) to the extent of farting and banging. To repeat and add to what's been said so far: have you checked that TDC as marked on the pulley is *really* TDC? Is static timing 11 BTDC and not 11 ATDC? Have you got the firing order correct (1-5-3-6-2-4)? My Leyland manual has 6&4 transposed... And do you have a spark on all plugs? Please do make sure you report back on progress. We always learn something. Good luck, John Quote Link to post Share on other sites
Peter Cobbold Posted April 12 Report Share Posted April 12 note that the rotor arm turns anticlockwise Peter Quote Link to post Share on other sites
roy53 Posted April 12 Report Share Posted April 12 8 hours ago, JohnC said: Have you got the firing order correct (1-5-3-6-2-4)? My Leyland manual has 6&4 transposed... And do you have a spark on all plugs? Please do make sure you report back on progress. We always learn something. Good luck, John Yes i got caught out by this several years ago. Spent hours checking everything. Some miss print. Quote Link to post Share on other sites
astontr6 Posted April 13 Report Share Posted April 13 On 4/11/2024 at 11:57 PM, JohnC said: Sounds to me like badly wrong timing. All the other suggestions here would certainly contribute to rough running, but not (I think) to the extent of farting and banging. To repeat and add to what's been said so far: have you checked that TDC as marked on the pulley is *really* TDC? Is static timing 11 BTDC and not 11 ATDC? Have you got the firing order correct (1-5-3-6-2-4)? My Leyland manual has 6&4 transposed... And do you have a spark on all plugs? Please do make sure you report back on progress. We always learn something. Good luck, John Have the injector fuel lines been properly bled and you can feel strong pulses? Bruce. Quote Link to post Share on other sites
WWT338J Posted April 15 Report Share Posted April 15 Distributor dog drive could be 180 degrees out. Easy to do. David TR6 repair operations manual.pdf Quote Link to post Share on other sites
Xmas6 Posted April 18 Author Report Share Posted April 18 Pat on the back all those who said it was the timing - I had it set at 11deg. btdc, set it to 11deg. atdc. and it fired up correctly! I feel like a proper numpty for not noticing this. No excuse not starting to paint it now. Thanks again for all your help! Cheers Neil Quote Link to post Share on other sites
John Morrison Posted April 18 Report Share Posted April 18 Don’t you just love this forum? John Quote Link to post Share on other sites
tim hunt Posted April 18 Report Share Posted April 18 1 hour ago, Xmas6 said: Pat on the back all those who said it was the timing - I had it set at 11deg. btdc, set it to 11deg. atdc. and it fired up correctly! I feel like a proper numpty for not noticing this. No excuse not starting to paint it now. Thanks again for all your help! Cheers Neil Result! However, you meant it WAS set at 11 deg atdc but NOW corrected to 11 deg btdc. Tim Quote Link to post Share on other sites
JohnC Posted April 19 Report Share Posted April 19 17 hours ago, tim hunt said: Result! However, you meant it WAS set at 11 deg atdc but NOW corrected to 11 deg btdc. Wot he sed Quote Link to post Share on other sites
roy53 Posted April 21 Report Share Posted April 21 oh no he didn't Quote Link to post Share on other sites
Kiwifrog Posted April 22 Report Share Posted April 22 On 4/18/2024 at 3:09 PM, Xmas6 said: Pat on the back all those who said it was the timing - I had it set at 11deg. btdc, set it to 11deg. atdc. and it fired up correctly! I feel like a proper numpty for not noticing this. No excuse not starting to paint it now. Thanks again for all your help! Cheers Neil Definitely not a numpty Neil, we have all been stuck at some point not being to see the wood for the trees. That's the great thing about this forum, loads of members willing to help out other enthusiasts enjoy their hobby. My 3a has been back on the road 10 years now, without this forum it would be still in bits ! cheers Alan Quote Link to post Share on other sites
JohnC Posted April 23 Report Share Posted April 23 On 4/18/2024 at 11:09 PM, Xmas6 said: I feel like a proper numpty for not noticing this. Why do you think I was so sure it was a timing issue? I rebuilt the engine on my 6 20yrs ago and can attest to the fact it will run backwards... Quote Link to post Share on other sites
Peter Cobbold Posted April 23 Report Share Posted April 23 4 hours ago, JohnC said: Why do you think I was so sure it was a timing issue? I rebuilt the engine on my 6 20yrs ago and can attest to the fact it will run backwards... ............and upside down. Quote Link to post Share on other sites
JohnC Posted April 24 Report Share Posted April 24 22 hours ago, Peter Cobbold said: ...........and upside down. You've explained it! It was Coriolis Effect Quote Link to post Share on other sites
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