Author Topic: Acorn nuts on head keep coming loose '87 zilla (Read 1574 times)

Rem28ga · « **on:** July 02, 2013, 02:37:08 pm »

Okay-
I am having issues with keeping the acorn nuts on my head tight (joke in there somewhere!). Anyway what are you guys using to keep them tightened to spec. I don't even have 2 hours on the top end yet and I am getting loose nuts! Have torqued them several times already. I noticed coolant leaking so I checked them and most were loose. The top end was re-done by HPR so it is an o-ringed head. Any suggestions.
Thanks

Zilla273 · « **Reply #1 on:** July 02, 2013, 02:48:42 pm »

what are u torqueing them too, also make sure the nuts are not bottoming out before contacting the head

I didn't have any issues keeping mine tight

Rem28ga · « **Reply #2 on:** July 02, 2013, 03:00:44 pm »

I have double copper washers under each nut which was recommended. I am torquing to 20lb. ft as the manual states.

Chuckie25 · « **Reply #3 on:** July 02, 2013, 03:10:15 pm »

Make sure your torque wrench is set to 20 ft pounds standard and not metric. There was a buddy of mine had that same problem. He kept blowing his head gasket. Turns out he was actually torquing them to like 3 ft lbs lol

Worst comes to worst get a new torque wrench

LT250RWV · « **Reply #4 on:** July 02, 2013, 03:16:46 pm »

I didnt think you had to torque the orings head AS tight.You might have pinch your orings.I thought you just got them tight and use some silicone on them. That might be your problems their

Rider414 · « **Reply #5 on:** July 02, 2013, 08:13:29 pm »

Coolant can seep up the holes in the head. The copper washers are suppose to seal this but sometimes they leak. I was told to use some sealant between the washer surfaces.

I have the same set-up as you and not issues so far. Are you using sealant?

MotorGeek - Jerry Hall · « **Reply #6 on:** July 02, 2013, 10:46:54 pm »

Quote from: LT250RWV on July 02, 2013, 03:16:46 pm

I didnt think you had to torque the orings head AS tight.You might have pinch your orings.I thought you just got them tight and use some silicone on them. That might be your problems their

Do not use any type of sealer on the o-rings.

Any and every head should be torqued to keep the bore round and minimize distortion. The head bolts do not have to be tight to make the o-rings seal but they have to be tight enough not to vibrate loose. 18 to 20 ft-lbs should be the proper torque spec.

WestTexasKing · « **Reply #7 on:** July 02, 2013, 11:10:31 pm »

Quote from: Rider414 on July 02, 2013, 08:13:29 pm

Coolant can seep up the holes in the head. The copper washers are suppose to seal this but sometimes they leak.

Copper washers are old tech, always leaking...you need to get your nuts O-ringed.

Rider414 · « **Reply #8 on:** July 03, 2013, 03:20:36 am »

Quote from: WestTexasKing on July 02, 2013, 11:10:31 pm

Quote from: Rider414 on July 02, 2013, 08:13:29 pm
Coolant can seep up the holes in the head. The copper washers are suppose to seal this but sometimes they leak.

Copper washers are old tech, always leaking...you need to get your nuts O-ringed.

I was talking about a O-Ring'd head with the copper washers under the acorn nuts.

LT500Kid · « **Reply #9 on:** July 03, 2013, 04:22:10 am »

after I had my cool head o ringed when I torqued my acorn nuts down the studs popped the top of the acorn nuts a little.

MotorGeek - Jerry Hall · « **Reply #10 on:** July 03, 2013, 06:48:19 am »

Quote from: WestTexasKing on July 02, 2013, 11:10:31 pm

Quote from: Rider414 on July 02, 2013, 08:13:29 pm
Coolant can seep up the holes in the head. The copper washers are suppose to seal this but sometimes they leak.

Copper washers are old tech, always leaking...you need to get your nuts O-ringed.

O-ringing the studs or nuts adds considerable cost to the job.

MotorGeek - Jerry Hall · « **Reply #11 on:** July 03, 2013, 06:50:00 am »

Quote from: LT500Kid on July 03, 2013, 04:22:10 am

after I had my cool head o ringed when I torqued my acorn nuts down the studs popped the top of the acorn nuts a little.

The studs have to be shortened to prevent this from happening on most LTs.

ken500r · « **Reply #12 on:** July 03, 2013, 07:08:32 am »

Man i wish i new that when i had my stuff at your shop i would of had you fix that. I plan on putting my quad back together this weekend. Can i just put an extra washers for now if i need too?

Mitch Keller · « **Reply #13 on:** July 03, 2013, 07:24:37 am »

Thats why I selling the taller Acorn nuts, and my washers are 0.040" thick, how much are your stud threads hanging out?

Washers are .040" thick x 16mm OD x 8.4mm ID #110 Alloy Half Hard
Acorn Nuts are Plated & Flanged, 16.75mm Flanged Base -Smooth Bottom X 16.50mm tall, Head Size is 12mm (Wrench Size) 15.90mm deep.

ken500r · « **Reply #14 on:** July 03, 2013, 07:28:19 am »

Glad i bought mine from mitch. Thanks Mitch

LT500Kid · « **Reply #15 on:** July 03, 2013, 08:28:54 am »

on mine they just peeked through making the top of the nut look like its hinged on one side. barely noticeable cause the motor sits so high in the frame on the 500's

Mitch Keller · « **Reply #16 on:** July 03, 2013, 09:04:56 am »

The Acorn Nuts are on without the copper washers shown here in these pics

Stpltn250r · « **Reply #17 on:** July 03, 2013, 09:23:48 am »

I run washers on my capped nuts but I put two dabs of silicone about the size of a bb and torque it down. haven't had one leak yet.

WestTexasKing · « **Reply #18 on:** July 03, 2013, 10:42:33 am »

LOL, I can't believe you guys.
O-ringing a nut? It was a joke!

PCS · « **Reply #19 on:** July 03, 2013, 11:57:41 am »

Quote from: Chuckie25 on July 02, 2013, 03:10:15 pm

Make sure your torque wrench is set to 20 ft pounds standard and not metric. There was a buddy of mine had that same problem. He kept blowing his head gasket. Turns out he was actually torquing them to like 3 ft lbs lol

Worst comes to worst get a new torque wrench

i didnt know ft lbs came in a metric version!

sorry i just couldnt help but giggle

LT500Kid · « **Reply #20 on:** July 03, 2013, 12:04:42 pm »

They're getting nuts with the o-ringing. Tee hee

WestTexasKing · « **Reply #21 on:** July 03, 2013, 01:10:38 pm »

20 N/m = 14.75 ft/lbs
20 in/lbs = 1.6667 ft/lbs

I could understand accidentally using N/m instead of ft/lbs, but in/lbs?
20 in/lbs is hand tight, bro.

Chuckie25 · « **Reply #22 on:** July 03, 2013, 02:26:15 pm »

Quote from: PCS on July 03, 2013, 11:57:41 am

Quote from: Chuckie25 on July 02, 2013, 03:10:15 pm
Make sure your torque wrench is set to 20 ft pounds standard and not metric. There was a buddy of mine had that same problem. He kept blowing his head gasket. Turns out he was actually torquing them to like 3 ft lbs lol

Worst comes to worst get a new torque wrench
i didnt know ft lbs came in a metric version!
sorry i just couldnt help but giggle

Lmfao Yall caught my drift.

Quadster · « **Reply #23 on:** July 03, 2013, 07:11:42 pm »

Quote from: LT500Kid on July 03, 2013, 04:22:10 am

after I had my head rung when I torqued my nuts down this stud popped the top off my nuts a little.

HUH?

Dezsled · « **Reply #24 on:** July 03, 2013, 07:19:22 pm »

He maxed out the nut, bottoming it out damaging the acorn part

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Author Topic: Acorn nuts on head keep coming loose '87 zilla (Read 1574 times)

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