Which valve stem seals leak
#61
SADFab Destructive Testing Engineer
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Lol yeah. We're all ripping seals. Uh huh.
I installed mine without the valves even in the head. Then I oil the valve and carefully slid it in.
I'm sure on @EO2K's professionally built head they ripped every single exhaust seal perfectly.
See above for his "ripped" seals.
I installed mine without the valves even in the head. Then I oil the valve and carefully slid it in.
I'm sure on @EO2K's professionally built head they ripped every single exhaust seal perfectly.
See above for his "ripped" seals.
Last edited by aidandj; 05-15-2017 at 01:00 PM.
#63
Former Vendor
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We use ST seals, they're installed when the heads are rebuilt at our machine shop, I have not noticed any problems or had any motor customers complain about this (although "no complaints" doesn't mean "no issues"). I personally have not noticed any problems on the two built motors in my own cars, though.
If there are customers out there with my engines who have had issues, I want to hear about it.
If there are customers out there with my engines who have had issues, I want to hear about it.
#66
Did you send them a link to this thread?
Thanks for the link @konmo, I ordered a set this morning. We'll see if they can get here before the weekend so I can install them.
Also, who is doing your head? I just saw you posted up trying to find a machine shop a couple months ago. I'm very local, so very interested who you ended up going with. Also, I posses valve train disassembly tools and happy to loan them out, if you don't want to buy a set.
That's where I ordered my set of replacement STs for the leaky STs that are in my head now. I ain't even mad tho, vendors are generally at the mercy of their distributors. Just like the Boundary front main seal thing we've been discussing. @Savington, care to weight in?
******* Keegan installed mine. Where is your God now, Martin at Supertech?
All that Dominator going into the exhaust certainly keeps the roofs of my exhaust ports clean.
Thanks for the link @konmo, I ordered a set this morning. We'll see if they can get here before the weekend so I can install them.
Also, who is doing your head? I just saw you posted up trying to find a machine shop a couple months ago. I'm very local, so very interested who you ended up going with. Also, I posses valve train disassembly tools and happy to loan them out, if you don't want to buy a set.
That's where I ordered my set of replacement STs for the leaky STs that are in my head now. I ain't even mad tho, vendors are generally at the mercy of their distributors. Just like the Boundary front main seal thing we've been discussing. @Savington, care to weight in?
******* Keegan installed mine. Where is your God now, Martin at Supertech?
All that Dominator going into the exhaust certainly keeps the roofs of my exhaust ports clean.
I ended up taking my cylinder head and block to Rob's Auto Machine in Hayward, CA. It was recommended to me by a fellow miata enthusiasts in Los Gatos. I also read some good reviews about them in many other forums. Rob Jr. even told me that they do/have done work for TSE, so if that's true, I would guess that the shop does pretty good work. I haven't picked up my block or head yet, but will be getting them this week I believe.
Where are you located? I'm in Salinas, CA. I'll most likely take you up on your offer to lend the valve train disassembly tools. I don't feel like leaving the Supertech seals in then making a mess and having to swap them out in the future anyways.
#67
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I'm going to look around and see if some sort of magical install tool exists, but I doubt it. Every time I look it up, generic install recommendation seems to be to just use a small socket of piece of tube.
#69
I use a plastic straw.... Just big enough to fit over the valve stem.
1. Cut a piece of medium plastic straw about 1" and insert the straw through the seal (about 6mm ID).
2. Insert valve stem through guide
3. Slips straw/seal over valve stem
4. Pull straw out
5. Use deep socket (forget Dia... 12mm?) to push seal over guide OD until it "clicks". Don't push more.
As you'd expect on this site... lube it well.
Repeat....
Sounds stupid but the straw keeps a the seal from catching on the edge of the stem and prevents any tearing. Or so it seems....
I've not done ST seals until this engine but in previous engines I've not had any issues. My method and I'm sticking with it...
1. Cut a piece of medium plastic straw about 1" and insert the straw through the seal (about 6mm ID).
2. Insert valve stem through guide
3. Slips straw/seal over valve stem
4. Pull straw out
5. Use deep socket (forget Dia... 12mm?) to push seal over guide OD until it "clicks". Don't push more.
As you'd expect on this site... lube it well.
Repeat....
Sounds stupid but the straw keeps a the seal from catching on the edge of the stem and prevents any tearing. Or so it seems....
I've not done ST seals until this engine but in previous engines I've not had any issues. My method and I'm sticking with it...
#74
I was going to pull my cams and then use this (Lisle Tools 36200 Valve Keeper Remover and Installer | eBay) tool.
#76
Mazda lists 2 different valve stem seals for the 1.8L. Following is a crossover list (including dimensional info, vehicles and part ##) from S.B. International who happens to supply a lot of OEM and aftermarket valve train parts.
Intake: KL01-10-155
KL10-10-155 Intake valve stem oil seal cross reference
Exhaust: KL02-10-155 (Supercedes B660-10-155)
KL02-10-155 Exhaust valve stem oil seal cross reference
B660-10-155 Exhaust valve stem oil seal cross reference
Enjoy...
Intake: KL01-10-155
KL10-10-155 Intake valve stem oil seal cross reference
Exhaust: KL02-10-155 (Supercedes B660-10-155)
KL02-10-155 Exhaust valve stem oil seal cross reference
B660-10-155 Exhaust valve stem oil seal cross reference
Enjoy...
Here in the UK, the Mazda dealer wants £162 for the full set of 16 valves, which is approximately $209!!!!
I am slightly nervous that Ford, or GM for example, may have had a 'cost down exercise' and changed supplier of their valves. So even though they measure the same on paper, they aren't genuine Mazda parts - which may be the difference.
Also, could someone please confirm that KL0110155 & KL0210155 are the correct part numbers for my '99 NB 1.8?
Whilst I'm here - double springs? I assume this is so you guys can have higher rev limiters? I am happy with a 7k limit so assume no benefit?
Thanks
Wilson
#78
The machinist who is working on my cylinder head told me that it is done. However, I provided Supertech valve seals to him. I just ordered a set of the 949 seals, looks like I'll be disassembling the head to swap these in instead. @emilio700, I noticed you used to sell the Supertech valve seals on your site, but you no longer do. What is your experience with the Supertech seals? Did you have any leak on you and that's why you no longer sell those?
#79
Possible different batches are slightly different sizes hence some people have a problem and some don't.
Here in the UK. 4 people running over 300whp had the problem along with one running over 400whp that I know of. This doesn't include myself.
When I removed them. They were generally bigger than the OEM. and this was less than 2000 miles. So it's possible they expanded slightly but not that much. All 16 were showing signs of leaking (This was also with running the correct inlet and exhaust seals)
Installing them wrong? I struggle to see how you would as it's quite an easy install. Just be sensible and gentle.
Even if It's down to different batches. It's a risk I wouldn't advise taking.
I had to install the OEM while the engine was in the car with the air compressor trick. A bitch of a job. But It solved my problem.
Here in the UK. 4 people running over 300whp had the problem along with one running over 400whp that I know of. This doesn't include myself.
When I removed them. They were generally bigger than the OEM. and this was less than 2000 miles. So it's possible they expanded slightly but not that much. All 16 were showing signs of leaking (This was also with running the correct inlet and exhaust seals)
Installing them wrong? I struggle to see how you would as it's quite an easy install. Just be sensible and gentle.
Even if It's down to different batches. It's a risk I wouldn't advise taking.
I had to install the OEM while the engine was in the car with the air compressor trick. A bitch of a job. But It solved my problem.
#80
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I'm not saying they will fit or they are any good, but it is an extensive list.