Bad knock under load

blue beasty said:

It was borrowed so I can't vouch for it, mine only goes up to 50 ft/lbs

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Worth getting another one. Teng Tools one from Screwfix are about £20.

Turboman said:

Although it says the bolts can be re-used, I always get new ones. And did you check there was no oil or water in the bottom of the holes before fitting?

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I did but I'll admit I'm wondering how thorough I was. I'll be checking everything twice before it goes back together that's for sure.

Turboman said:

did you check there was no oil or water in the bottom of the holes before fitting?

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And check there is no muck in the bottom of the bolt holes which could stop the bolt clamping the head fully even though it is torqued fully.

Wimblowdriver said:

And check there is no muck in the bottom of the bolt holes which could stop the bolt clamping the head fully even though it is torqued fully.

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Bit of oil or water in the bottom can crack the block by hydraulic action when the bolts are tightened.

blue beasty said:

Didn't feel I needed to, bolts spin down happily by hand.

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if there is stuff at the bottom of the hole, you are screwed. a bottoming tap is what you need, and a air hose to blow stuff out of the holes

Thor1950 said:

if there is stuff at the bottom of the hole, you are screwed. a bottoming tap is what you need, and a air hose to blow stuff out of the holes

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If the threads are bad, you need a tap. If they are OK, I just roll up a lint free rag, and poke it down the holes. If the rag is clean and dry to start off with, you can see if it has absorbed any oil or water.

Thor1950 said:

if there is stuff at the bottom of the hole, you are screwed.

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I spend hours cleaning blind threaded holes on the old bike engines I rebuild. Usually digging out ancient Hermetite (yeah, that old) with long pointy things and compressed air. And checking screw & bolt lengths to ensure they do clamp properly when tightened. Surprising how a leaky old engine can be made gas and oil tight when care is taken.

Turboman said:

If the threads are bad, you need a tap. If they are OK, I just roll up a lint free rag, and poke it down the holes. If the rag is clean and dry to start off with, you can see if it has absorbed any oil or water.

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What I have seen and experienced is the last few thousandth of thread depth is where the issue will occur. making the bolt bottom out when doing the final torque of the head

Thor1950 said:

What I have seen and experienced is the last few thousandth of thread depth is where the issue will occur. making the bolt bottom out when doing the final torque of the head

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It can happen, but shouldn't on a properly designed and made engine.

Turboman said:

It can happen, but shouldn't on a properly designed and made engine.

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are you saying land rover are proper engines

Thor1950 said:

are you saying land rover are proper engines

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I have changed a lot of LR head gaskets, mostly on older engines, and not seen a problem with bolt grounding.
I have heard it can be an issue on some Tdi engines.

I actually like the landrover petrol engines, most of the diesels I don't think are so great. But they are adequate for high mileages if carefully maintained and serviced.

Turboman said:

but shouldn't on a properly designed and made engine.

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OK, but we've got landy engines, not something built in a jet propulsion lab or a jap car factory.

Wimblowdriver said:

OK, but we've got landy engines, not something built in a jet propulsion lab or a jap car factory.

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See post 71. They are adequate, although maybe not as good as a Perkins, Cummins, or Gardner. Not really had any problems with the many I have owned and operated.

I have teng torque wrenches, I like that they do torque and angle, well made bits of kit and reasonably priced

suburban said:

I have teng torque wrenches, I like that they do torque and angle, well made bits of kit and reasonably priced

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Yep, me too !! - got two - excellent pieces of kit... though I'm not sure you can get one for £20 ............

suburban said:

I have teng torque wrenches, I like that they do torque and angle, well made bits of kit and reasonably priced

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I like Teng Tools, always found them strong and good value, and they honour their lifetime guarantee even if you have abused the tool.

Disco1BFG said:

Yep, me too !! - got two - excellent pieces of kit... though I'm not sure you can get one for £20 ............

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Apologies, you are right. Just checked the Screwfix site. Magnusson torque wrench £21.95, sure that would be adequate for BB. Teng Tools half inch drive is 52 quid, which still isn't a lot of money.

Turboman said:

Apologies, you are right. Just checked the Screwfix site. Magnusson torque wrench £21.95, sure that would be adequate for BB. Teng Tools half inch drive is 52 quid, which still isn't a lot of money.

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Doesn't give a torque range for the Magnusson but I'll check it out when I can get a lift into town.

blue beasty said:

Doesn't give a torque range for the Magnusson but I'll check it out when I can get a lift into town.

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Borrow mine if you want to come and get it. It is old, but expensive, and it goes up to 200 ft/lbs.

Had a quick look on the way to work this morning. The head is true but there is a slight dip on the block, maybe 2 thou between cyls 3 & 4 and slightly less between 1 & 2.