Author Topic: threepots head job  (Read 11698 times)

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February 03, 2017, 10:10:54 PMReply #60 on

Offline Sin_Tiger

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a popular tuning mod for the Speed Triples was to fit 750 pistons to raise compression.
That Clive Woods bloke would probably know for sure.

Still is but found luck trying to find any 750 pistons.
I used to have long hair, took acid and went to hip joints. Now I long for hair, take antacid and need a new hip joint

February 03, 2017, 10:19:40 PMReply #61 on

Offline JayDub

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Maybe you could contact Clive on face*ook, I dunno if that would be OK, but he seems a helpful bloke.
"When I was younger I could remember anything, whether it happened, or not."

February 04, 2017, 11:04:16 AMReply #62 on

Offline threepot

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Valves arrived,and there is a slight difference. You can see a slight narrowing on the bottom of the stem. Only thing I can think,that they 'beefed up ' the valve for the Super3? Can't see p/n for them?
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February 04, 2017, 01:38:35 PMReply #63 on

Offline London_Phil

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looks more like weight reduction of valve, and possible part of a porting/ flow improvement

February 04, 2017, 03:47:24 PMReply #64 on

Offline threepot

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I've just messaged Clive Wood. If I don't get a reply,I'll phone Triumph on Monday.
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February 04, 2017, 05:19:27 PMReply #65 on

Offline London_Phil

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February 04, 2017, 09:59:49 PMReply #66 on

Offline threepot

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Thanks Phil,appreciate your input. But I'm concerned buying used,that it might not be in much better state ? I've had a reply from Clive,but he thinks I was referring to carburetor inlets?? Re msg him on that.
I stripped down radiator earlier. What a job that was! All the fasteners were seized solid. Had to cut 3 loose. The fan has corrosion,inside and out. And I noticed coolant leaking from one corner? So it might be f#@$#d?
New unit,with fan,fasteners,brackets etc..........not much change from £500.  Shocking! But no surprise really?
I understand now why insurance companies 'write' bikes off when they're involved in accidents!
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February 05, 2017, 09:17:19 AMReply #67 on

Offline London_Phil

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I've got the fan motor assy from my spare which had a melted frame, if its any help.
I've got the old Tiger rad which could be rebuilt if it's any use to you?
There is someone on ebay advertising custom built ones too.

February 10, 2017, 05:46:29 PMReply #68 on

Offline threepot

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I phoned triumph about the valves. Spoke to a Guy in technical..'well,I've been here 14yrs,and I'm not aware of another type they used in the t3'?? Bit vague really. He did confirm that the pn was OK to use. So the last couple of days,I've been 'lapping' them in. The exhaust's seemed to have 'lapped' in nicely. You can see a nice 'flat' on both the valve,and the seat. But I'm not so sure about the inlets? I need to have a closer look now I've cleaned the head. I'm worried about the 'seat' profile? All the inlets that came out,had a 'round' profile,and I'm concerned thats the profile on the 'seat'? :icon_scratch: Maybe they need re cutting? Anyway,the head is nice and clean!
Story behind the Eucryl tooth powder.. I was talking to a guy that drinks in my local. We were discussing my 'head job',and he mentioned some guy's back in Ireland,that raced bikes,and they used it to polish the surface after lapping! Apparently,they used to get good results in compression tests after using it. So I tried it. And the next time I see him,I can say I did it :icon_wink:
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February 11, 2017, 03:44:59 PMReply #69 on

Offline threepot

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Well,I had another go at lapping inlets in this morning. I can clearly see a consistent,and uniform lapped area on all seats,and valves. So I'm going to leave it like that. I need to order new valve seals,then I'll replace valves,and I can then replace cams whilst the head is off,and see how they're lying in relation to shims?
Out of curiosity,are replacement 'seats' available? Or is it a 'new' head job?
Also,if the existing seats are recut,how much material is removed. Wouldn't that effect the depth of the valve,and or clearance again?
Paranoia :icon_wink:
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February 11, 2017, 04:34:41 PMReply #70 on

Offline Sin_Tiger

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Give the newly lapped valves a sharp dunt with a hammer to seat them properly and flatten the fur from lapping, if you lift them after that you should see a bright continuous ring. Without doing that your clearance will close a measurable amount by the time the engine starts to get warm (if it ever does  :augie )

I've only ever come across one cylinder head that couldn't have the valve seat replaced and that was a two stroke rotary valve job that had the head cast around the seat. Manufacturers might not recommend it as its done from new under very controlled circumstances and they've probably never tried doing it as a repair. It might take a specialist with a lot of experience but that's why there are so many vintage bikes still in usable condition.
I used to have long hair, took acid and went to hip joints. Now I long for hair, take antacid and need a new hip joint

February 11, 2017, 11:08:21 PMReply #71 on

Offline threepot

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I've got to say though,this engine has 50k miles,not a lot really,but shows hardly any wear on any surface. All the cylinders and rings are in spec,and the cam mating surfaces in the head look like New. Maybe a testament to factory machining,or my maintenance in the last 18yrs?
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February 14, 2017, 01:44:00 AMReply #72 on

Offline bemusedinsojo (OP)

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I've got to say though,this engine has 50k miles,not a lot really,but shows hardly any wear on any surface. All the cylinders and rings are in spec,and the cam mating surfaces in the head look like New. Maybe a testament to factory machining,or my maintenance in the last 18yrs?

Maintenance is key I think. All the engineering in the world can't help dirty oil damage. And other suggested maintenance.

February 14, 2017, 05:26:15 PMReply #73 on

Offline threepot

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Fitted the valves earlier. Don't laugh at my workstation! It was that,or a garage full of sawdust! My friend told me last night that he was resuming his woodworking activities. And I was all set up in the garage to go :icon_rolleyes:
All the exhaust were more or less as before,but probably due to the lapping,I need to go down 1 size on 4,and 2 were OK.
Fortunately,I already had a good supply of spare shims,so to check the inlets,I put in some 'medium' thickness shims,from which I could measure for the final size. And I'm glad to say,I need 5 @ 2.70,and 1 @ 2.75. So it looks like the valves are 'seating' all the same. Not sure what the gaps are from 'new' though? But I think  2.70 shims are OK?
I've gone through my supply,and I only need to purchase 1 shim :thumbsup
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February 14, 2017, 09:53:23 PMReply #74 on

Offline bemusedinsojo (OP)

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 Almost done. Lot of work you did.