• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

TR2/3/3A It was running great....until

GTP1960

Jedi Knight
Offline
At long last I have my tr3a back together and was tuning the engine.
i noticed the distributor post was not tightened down & in the process I accidentally raised the distributor up and unseated it.
after that..... nothing. Could not restart & I don't think I have the distributor seated correctly.
So my question is: Is there a trick to reseating a distributor ?


Appreciate any advice.

guy
 

TR3driver

Great Pumpkin - R.I.P
Offline
Sounds like you let it get high enough for the tang to pop out of the slot. Try taking the cap off and turning the rotor until the tang lines up again. Push down lightly while turning so you can feel it drop into the slot, then push the distributor down where it belongs.
 

Geo Hahn

Yoda
Country flag
Offline
If trying to do this by feel a photo may help you visualize what you're trying to do.

The slot for the drive dog is asymmetrical, i.e. crosses the shaft slightly off-center so the distributor shaft only fits one way. Looks something like this when #1 is at TDC on the compression stroke:

Driveafter.jpg


Inserted at that point should have the rotor pointing at the #1 spark plug:

25D_zps1263a732.jpg


Of course, yours may be slightly or even completely different if someone has messed with the usual set-up - can still work but will look different.

If you can't get it to seat by feel you might remove the distributor, move the engine to TDC #1 compression and see what it looks like - then go from there.
 
OP
GTP1960

GTP1960

Jedi Knight
Offline
"Of course, yours may be slightly or even completely different if someone has messed with the usual set-up - can still work but will look different."

thx Geo & Randall,
i was able to seat it once I turned the rotor.
However, I realized the fixing clamp is not raised enough to secure the base of the distributor.

( the PO's three zip ties securing & stabilizing the vacuum line to the fuel line should have been a red flag, I guess)

any reason not shim the fixing clamp collar a half inch, so it can snug the base of the distributor?

Thx again.

Guy



 

Attachments

  • image.jpg
    image.jpg
    49.8 KB · Views: 34

TR3driver

Great Pumpkin - R.I.P
Offline
I think if you open the clamp up, you'll find that the distributor body will slide down where it belongs. If not, I'd look for the reason why as it may indicate something else wrong.

Don't get carried away when retightening the clamp. The body is just pot metal and not very strong. I've seen people crush that flange where the clamp is supposed to grip.
 
OP
GTP1960

GTP1960

Jedi Knight
Offline
I think if you open the clamp up, you'll find that the distributor body will slide down where it belongs. If not, I'd look for the reason why as it may indicate something else wrong.

Don't get carried away when retightening the clamp. The body is just pot metal and not very strong. I've seen people crush that flange where the clamp is supposed to grip.

Maybe I did over tighten: I was cranking away before I realized I wasn't getting anywhere.
 

TR3driver

Great Pumpkin - R.I.P
Offline
Maybe I did over tighten: I was cranking away before I realized I wasn't getting anywhere.
The flange looks OK in your photo, so I think you're probably OK on that score. But you'll probably need to take the bolt out and pry between the ears to get it to open back up far enough. Maybe loosen one of the nuts as well.
 
OP
GTP1960

GTP1960

Jedi Knight
Offline
FWIW - That appears to be a distributor for a 1971 Sprite or Midget.
Don't know about that, ( how can you tell?) but it works pretty well, when it's tightened down properly.
( Randall was right, I had the collar cinched down so tight the base of the distributor was Teed up like a golf ball......it made for some impressive backfires for some reason). No telling what damage I did!

It's not timed & tuned just right, but it sounds 100% better & my belated "winter projects" are finally starting to meld.
i'm beginning to see the hi-beam at the end of the tunnel.
 

TR3driver

Great Pumpkin - R.I.P
Offline
So you're reading that last digit as a '9' ? Looks more like an '8' to me.

And while the housing is obviously wrong for a 3A (though it would work more or less); that doesn't mean that someone hasn't swapped around the internal parts to be more appropriate. The surface looks bead blasted to me, which suggests some rebuilder may have been at it. Internally, only the springs & point cam are different between different versions of 25D4 (plus the vacuum module of course).
 

Geo Hahn

Yoda
Country flag
Offline
So you're reading that last digit as a '9' ? Looks more like an '8' to me...

It is hard to read, but 41228A would have originally been a 25D6 (6 cylinder engine) though, as you note, any 25D distributor body could be reworked to almost any other configuration if internals are changed.

I was surprised to discover that the spare base plate and points I carry for my 4 cylinder TR will also work in the distributor of my 6 cylinder Jaguar. Obvious once I thought it thru but initially seemed amazing the differences between a 4-cyl and 6-cyl distributor are so small.
 
OP
GTP1960

GTP1960

Jedi Knight
Offline
I dbl checked that model # is 9.


do you think there is any advantage with changing back to the correct distributor, or a "flame thrower" type?
Though this car has electronic ignition.

thx
 

TR3driver

Great Pumpkin - R.I.P
Offline
No way to answer that question, until we know if it has been modified. But even if it hasn't, I don't think you'd notice a big difference. The Sprite advance curve is less aggressive than the TR, but you can compensate for that by bumping up the initial timing (if you don't use the hand crank). Here's a quickie plot of the centrifugal advance curves.
image001.jpg
 

Geo Hahn

Yoda
Country flag
Offline
And on a distributor that old the curve may differ from the original anyway as springs may have been changed or at the very least gotten weaker.

A friend has a Sun machine and last week I was able to see the advance curve I am really getting on one of my distributors. It was at variance from the factory spec though the engine runs quite well -- no change will be made but good to know what I have:

Sun_zpsxfb0ontr.jpg


A key number you can find out (and possibly tune for) is what advance you see 'all in', i.e. the advance at high RPMs. Set that about right and the rest may fall into place.
 

Geo Hahn

Yoda
Country flag
Offline
Randall - What application did you use to produce that graph? I suppose I have something that would do graphs if I took the time to dig into it. Thanks!
 

TR3driver

Great Pumpkin - R.I.P
Offline
Randall - What application did you use to produce that graph? I suppose I have something that would do graphs if I took the time to dig into it. Thanks!
It's just an Excel spreadsheet. Probably not the friendliest/easiest software to use (and certainly not the cheapest) but I kind of got used to it at work. If I were starting over, I'd probably go with something like Open Office's Calc
https://www.openoffice.org/product/calc.html

untitled.jpg
 

Geo Hahn

Yoda
Country flag
Offline
Thanks, that pretty easy to swipe (I've got the intro version of Excel (aka 'Bill wants you to buy the real one') and will set it up.
 
Similar threads
Thread starter Title Forum Replies Date
doates Spitfire Spit was running great Triumph 17
P TR6 What make and size tire was on the TR6 when it left the factory? Triumph 7
S TR2/3/3A TR3 has me stumped, it runs then dies over and over and the exhaust system was pulled Triumph 9
Gliderman8 General MG The car that never was MG 6
Got_All_4 TR6 This frame was sectioned Triumph 9
S TR2/3/3A and the radiator was leaking. Triumph 7
Jim_Gruber Boy was I ever surprised on Saturday Spridgets 11
K TR2/3/3A It was all going so well....... Triumph 11
tinman58 General TR Well that was close! Triumph 12
T Was Sophia Loren ever photographed with a Healey? Austin Healey 2
Trevor Jessie When was the last time you bled your brakes? Spridgets 4
Jim_Gruber Hubs a Rocking on side where Speedi Sleeve was installed Spridgets 5
HealeyRick DMH was a Nasty Boy Austin Healey 2
catfood So thats what it was... Other British Cars 0
Z TR4/4A Door Weather Strip Channel - Was this added? Triumph 4
tinman58 General TR It was just a loose wire Triumph 15
Jim_Gruber I woke up Bugsy this afternoon after about a month long nap and he was cranky Spridgets 7
T Was the Bugeye a Mk I from the get-go? Spridgets 9
PC Dang, that was too good to be true... Restoration & Tools 3
Jim_Gruber Bugsy was out for his first real romp today! And it was fun!!!! Spridgets 3
JPSmit Tesla - but that's not what was interesting Other Cars 2
H At least the Bugeye Shirt was at the HPDE this weekend. Spridgets 5
drooartz MGB Today was a good day - the MGB is legal! MG 6
longbridgehealey When did you buy your first LBC, and what was it? Spridgets 37
S What was it? Other Cars 18
J Cloth interior in AH-3000? Was it ever fitted? Pleated inserts maybe? Austin Healey 7
Sopwith_Camel was this wire brown in 1967? Jaguar 5
CZ_Dave MGB Was I missed? MG 2
bighealeysource Was 100M from Chasing Classic Cars sold this weekend? Austin Healey 20
S TR2/3/3A 37XXX and 27XXX the steering column was split Triumph 6
C The 1956 Jaguar XKSS was one of a kind Jaguar 10
H Aston Martin DB4 converible found in UK awhile back--what was paid for it? Other British Cars 0
C Was the 2013 Jaguar XJ Ultimate the Crown Jewel of Luxury? Jaguar 0
C Just how good was the Jaguar E-Type? Jaguar 10
JPSmit What was on the trailers was most interesting today Spotted 2
DanLewis And I thought the Bugeye was small... Spridgets 6
jaegzie Disc brake upgrade was fine now major alignment issue. Spridgets 6
S What Was it Like? Spridgets 10
krswen Remember when carb cleaner was so strong .... Restoration & Tools 12
HealeyRick Wedge It Was All the TR7's Fault Triumph 7
DNK Was this real to start? Lotus 7
RickB I was wrong. Again. Not ignition switch! Spridgets 16
RickB Thought I saw a 210 - but it was just a B Spridgets 6
5 TR2/3/3A Who was OEM glass manufacturer for tr3 windshields Triumph 1
AngliaGT "The Older i Get - The Faster I Was"............ Racing 1
J Having trouble getting Forum to work on IE 9 since it was switched to the new format. FORUM Help 7
weewillie was in the Audi dealership Other Cars 4
Cottontop Don't we WISH it was this easy Restoration & Tools 5
nevets sputtering issue fixed...it was the timing Austin Healey 4
Frankenhealey Goodwood Spring Sprint - It was WET Austin Healey 11

Similar threads

Top