07-03-2023, 07:59 PM
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#16
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Join Date: Apr 2012
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Join Date: Apr 2012
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Well, I received my bore scope...
I bought a bore scope and had a look inside! There were a few pieces inside but no appreciable damage to the cylinder walls, so using a shopvac and some flexible plastic tubing, sucked out the pieces that were left in the cylinder but unfortunately the spark plug wouldn't torque, and just spun. I will try a helicoil... does anyone have advice on inserting a helicoil without pulling the head? I think if I'm slow and careful, I can suck out the shavings of aluminum using my vacuum, does anyone have better suggestions? 
Clean after vacuum:
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
Electronics/Telecommunications Engineering Technologist
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07-03-2023, 08:14 PM
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#17
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Join Date: Jan 2014
Location: Seattle
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07-06-2023, 11:09 PM
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#19
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Join Date: Apr 2012
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Quote:
Originally Posted by MaineRunna
In 39 years of being in the auto repair business I have never seen an ignition coil explode. What I have seen a lot of is spark plugs coming loose and combustion gasses melting the coil boot. If this was on the other side of the engine you probably would have found the plug dangling outside of the engine by the spark plug wire, but the coil holds it in place on the RH side. The oil was probably already in the spark plug tube from a leaking seal. The plug doesn't look that bad so it probably didn't damage the piston, valves or cylinder walls. Check with a borescope if you can, but a compression test will probably be sufficient. You most likely don't have any threads left in the spark plug hole. It can be fixed without removing the cylinder head with a spark plug thread insert. I have seen this many times on the 3400.
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I did a search and funny enough youre absolutely right! It seems cyl 3 is a common one to blow out, and youre right, theres no threads left. I just received a helicoil insert and tools from Amazon this afternoon, so this weekend hopefully it'll be back on the road. I put a bore scope in last weekend and discovered no damage to the cylinder, a couple of small scratches on the piston and vacuumed out the cyl with a small hose. Fingers crossed, on the helicoil.
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
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07-06-2023, 11:16 PM
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#20
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Quote:
Originally Posted by brillo_76
you can still see the cross hatching on the cylinder wall... I would say, by the looks of that side looks good. Did you get a 360 of that cylinder wall of that cylinder?
Does it look good up by the head gasket?
Great job getting the pieces out of the cylinder.
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I was able to rotate the camera around the cylinder and it looks good, after I vacuumed out the cylinder, however, the head of the camera was too long to bend it so I could see the head gasket and valves, I'm assuming the valves are ok as there was no other debris in the cylinder. Now for a helicoil install this weekend as the threads were screwed.
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
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07-10-2023, 10:58 PM
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#21
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Ya! She's back on thr road!
Well, I installed a helicoil spark plug insert this weekend. Great product! Installed flawlessly used grease on the end of the tool, it caught all the shavings. Checked with the bore scope, perfect. This evening, after the loctite set, re-assembled, and she purred to life! All I can say is I recommend everyone should check their plugs every season, at least--- I changed all the plugs and discovered spark plug 6 was also not tight. My 4Runner is back! YAHOO!
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
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07-11-2023, 12:15 AM
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#22
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Join Date: Oct 2022
Location: Littleton, CO
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Stories like this sure make me glad I checked my plugs a few k ago and discovered that the PO used cheap single strap plugs. Gave me a chance to make sure things were torqued up right, that's for sure. Need to replace plug wires sometimes soon too but she's running really good after replacing the upstream o2 sensor. Glad you were able to successfully helicoil repair the head though, that has to be a huge relief.
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07-12-2023, 08:50 PM
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#23
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Quote:
Originally Posted by Rushthezeppelin
Stories like this sure make me glad I checked my plugs a few k ago and discovered that the PO used cheap single strap plugs. Gave me a chance to make sure things were torqued up right, that's for sure. Need to replace plug wires sometimes soon too but she's running really good after replacing the upstream o2 sensor. Glad you were able to successfully helicoil repair the head though, that has to be a huge relief.
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You're not kidding! Huge relief! I was looking at JDM's out of curiosity, when this first happened and they have doubled in price since I did my swap in 2016. I had a second set of coils and ordered spark plugs, wires and tube seals from RockAuto, helicoil and borescope from Amazon. I just had to wait 1.5 weeks and I had everything ready. The work was ridiculously easy. I looked a several videos of thread repair options, and happened on an interesting video. this guy tested several different products and I was interested to see that helicoil time-sert etc held MUCH better than direct threaded aluminum--- makes sense if you think about it. I wonder why manufacturerers don't use thread inserts for spark plugs and heads... cost?
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
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07-12-2023, 09:38 PM
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#24
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I really missed it!
I'm so relieved to have my 4Runner on the road. I had ordered a muffler when this event happened. It arrived while the truck was dead in the driveway, so next weekend I'll replace it. I hope I can remove the O2 sensor without much trouble--- luckily I'm not in the rust belt.
My last good pic:
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
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07-17-2023, 08:55 PM
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#25
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Quote:
Originally Posted by Rushthezeppelin
Stories like this sure make me glad I checked my plugs a few k ago and discovered that the PO used cheap single strap plugs. Gave me a chance to make sure things were torqued up right, that's for sure. Need to replace plug wires sometimes soon too but she's running really good after replacing the upstream o2 sensor. Glad you were able to successfully helicoil repair the head though, that has to be a huge relief.
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All is good! Finished the muffler replacement, wow, really easy-- probably the easiest exhaust job I've done on any vehicle, she's smooth (since the plug replacement/helicoil insert) and quiet once again!
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
Electronics/Telecommunications Engineering Technologist
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08-07-2023, 06:10 PM
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#26
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Join Date: Sep 2007
Location: Carova Beach OBX
Age: 56
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Anyone got a link to the time cert and Helicoil kits for this job for this Job on my 2000? Not sure which one to order.
Parts numbers??
MIne just took a shit and I'm stranded out at the very end of the 4x4 area on Carova Beach, OBX. Thank god I have my Coleman mini-bike to get to the mail boxes to pick up parts. Help a brother out?
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96 4 runner 3.4L SR5, Borla Touring catback, Rough Country 3 " Suspension (new kit), Powerstop Extreme Towing brake kit, B&M super cooler and Koyo radiators in series, 31" Michelin LTX A-2 tires, Barnes 4x4 heavy duty rear Differential cover. Taco tie rods and upper and lower ball joints 
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08-07-2023, 10:52 PM
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#27
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Join Date: Jul 2022
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Quote:
Originally Posted by davidch
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Agree.
Andreas
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2001 SR5 4Runner 4WD, Dorado Gold, 546,XXX 1-owner miles
2002 4Runner, Dorado Gold, 226,XXX miles
1998 4Runner, Oxidized, 265,000 miles
2014 Audi A4 quattro, Monsoon Gray
1995 Porsche 993, Polar Silver
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08-08-2023, 09:51 AM
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#28
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Join Date: Sep 2007
Location: Carova Beach OBX
Age: 56
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Thanks , but I saw that link in the thread. All that does is take me to a website. I was hoping someone could tell me what exact Heli-coil kit to get , size wise? I guess it's just 14x1.25?
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96 4 runner 3.4L SR5, Borla Touring catback, Rough Country 3 " Suspension (new kit), Powerstop Extreme Towing brake kit, B&M super cooler and Koyo radiators in series, 31" Michelin LTX A-2 tires, Barnes 4x4 heavy duty rear Differential cover. Taco tie rods and upper and lower ball joints
Last edited by popsmckracken; 08-08-2023 at 10:20 AM.
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08-12-2023, 07:59 AM
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#29
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Member
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Join Date: Apr 2012
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Join Date: Apr 2012
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Quote:
Originally Posted by popsmckracken
Anyone got a link to the time cert and Helicoil kits for this job for this Job on my 2000? Not sure which one to order.
Parts numbers??
MIne just took a shit and I'm stranded out at the very end of the 4x4 area on Carova Beach, OBX. Thank god I have my Coleman mini-bike to get to the mail boxes to pick up parts. Help a brother out?
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Sorry, just noticed your post! If you haven't solved your problem yet, this is what I ordered off Amazon:
If you're on the trail , use lots of grease on the end of the cutting tool, the great thing about this is it uses the original hole to centre the tap so no drilling required! Good luck!
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
Electronics/Telecommunications Engineering Technologist
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08-12-2023, 08:01 AM
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#30
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Member
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Join Date: Apr 2012
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Join Date: Apr 2012
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Quote:
Originally Posted by popsmckracken
Thanks , but I saw that link in the thread. All that does is take me to a website. I was hoping someone could tell me what exact Heli-coil kit to get , size wise? I guess it's just 14x1.25?
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See my last post, the kit number is at the top of the package, in the pic.
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
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