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Author Topic: Help!Bolt broke in engine block!  (Read 2988 times)

Leo C.

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Help!Bolt broke in engine block!
« on: December 15, 2011, 05:15:40 PM »
Engine: 4g33
Problem: One of the three (upper) bolts of the fuel pump broke leaving the broken piece deep inside the hole. Now, only two bolts are holding the pump. The one above and one below.

Questions: What's the best thing to do? Rethread for a bigger bolt? Remove the broken bolt? How? Leave it as is? Will the two bolts hold the pump in place without any problems? Is there a solution for this without removing the engine?

As of now, the engine runs fine without any problems.

Linkback: https://www.autoindustriya.com/talkboard/well-maintained/18/helpbolt-broke-in-engine-block/32441/

Offline HyperPower™

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Re: Help!Bolt broke in engine block!
« Reply #1 on: December 15, 2011, 05:57:24 PM »
Looks like the broken bolt needs to be drilled-off and replaced with a new one. Retreading won't be necessary but it all depends on how it was removed though. I don't see it causing any issues if the broken bolt still keeps a groove-hold of the pump. IMO.

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Leo C.

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Re: Help!Bolt broke in engine block!
« Reply #2 on: December 16, 2011, 09:28:59 AM »
The broken bolt does not hold the pump or is anywhere near the flange. The bolt broke deep inside the hole.

Offline czn030

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Re: Help!Bolt broke in engine block!
« Reply #3 on: December 16, 2011, 03:17:30 PM »
Baka naman kaya pa yan dukutin sa machine chop.
"The Bible tells us to love our neighbors, and also to love our enemies; probably because generally they are the same people".

Offline Brent

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Re: Help!Bolt broke in engine block!
« Reply #4 on: December 16, 2011, 11:35:54 PM »
They can normally use a hand-tap to extract the broken bolt.

Leo C.

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Re: Help!Bolt broke in engine block!
« Reply #5 on: December 17, 2011, 09:14:10 AM »
Thanks everybody. I'm just fishing for ideas on the best possible and easiest way baka meron na naka experience nito.  :)

Offline Victorb

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Re: Help!Bolt broke in engine block!
« Reply #6 on: December 22, 2011, 10:47:11 PM »
rethreader bolt would be the best tool to use (same size). it will grind the old / half metal inside-out. happened to me when removing my valve cover. easy fix

http://toolmonger.com/wp-content/uploads/2009/01/craftsman-master-rethreading_s.jpg

Offline Leepu Awlia

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Re: Help!Bolt broke in engine block!
« Reply #7 on: December 22, 2011, 10:58:25 PM »
how deep in the hole?
how much thread is exposed in the hole?
what size bolt?
is this the mechanical fuel pump?
is this in the head or block?
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Leo C.

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Re: Help!Bolt broke in engine block!
« Reply #8 on: December 23, 2011, 09:34:13 AM »
Thanks EudmAccord.

@Leepu: the broken bolt is around 1.5 inches deep, no thread is exposed in the hole, the bolt is around 6mm (size), yes, this is the mechanical pump at the side of the cylinder head.

The real problem really is the broken bolt is deep inside. I cannot anymore use a shorter bolt because the original bolt is not a full thread bolt. The threaded part is the broken part left deep inside the hole.

Offline Leepu Awlia

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Re: Help!Bolt broke in engine block!
« Reply #9 on: December 23, 2011, 10:11:01 AM »
so its not in the iron block but in the aluminum head?
is there direct access to it with a drill?
If it doesnt hold the pump, what is its purpose?

Leo C.

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Re: Help!Bolt broke in engine block!
« Reply #10 on: December 23, 2011, 10:25:55 AM »
so its not in the iron block but in the aluminum head?
is there direct access to it with a drill?
If it doesnt hold the pump, what is its purpose?

It's in the head. Left side.
Yes, I can access it with a drill.
It's one of three bolts that holds the pump. Two on top and one below. The broken one is the one on top. Now, the pump is held by one bolt on top and one below.

By the way, the car still runs and the pump operates normally even with only two bolts.

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