Nooooooooo

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offroadmad said:
so whip the rockers off & check for a bent pushrod. will i know if a valves bent from that too or is it a head off & look job - sorry but im a newbie to ohv engines
Click to expand...

Take rocker cover off

Turn engine over slowly and watch te valves if 1 don't come back up it's bent and sticking.


For pushrod get a flat piece of glass and roll the rods back and forth if bent you'll see it.
 
Thanks much appreciated - will check pushrods tmrw but it definatly sounds like something is hitting something else in there - so what your saying is the rods bend instead of the valves ??? is it possible that would create a metal hitting metal sound like i have ?
I understand its not gonna run happy with a bent rod as the valves will not be opening correctly but what would be hitting together in a bent rod situation is what im saying ??
 
offroadmad said:
Thanks much appreciated - will check pushrods tmrw but it definatly sounds like something is hitting something else in there - so what your saying is the rods bend instead of the valves ??? is it possible that would create a metal hitting metal sound like i have ?
I understand its not gonna run happy with a bent rod as the valves will not be opening correctly but what would be hitting together in a bent rod situation is what im saying ??
Click to expand...


Rod is shorter than it shoud be due to bend this means Valve int opening fully and pushrod is bouncing around. At 2 or 3,000 RPM that soon starts rattling
 
im so chuffed - removed rockers - valves all reaching full height, i have a bent pushrod
cheers for all your advice hopefully have it sorted soon :D
 
offroadmad said:
and it has new big ends now - it was a little knocky when cold !!!

im so chuffed - removed rockers - valves all reaching full height, i have a bent pushrod
cheers for all your advice hopefully have it sorted soon
Click to expand...

Don't jump to that conclusion too soon. It may not be that. Good if it is though.

I wish I had seen this thread sooner, because there was a lot of hasty diagnosis going on, and conclusions being jumped to. Whatever that noise was, big ends it was not, and not much like mains either.

Everyone who has an engine should have and know how to use, a probe stethoscope. I have mine within reach right now. It is amazing how accurately "bad noises" can pinned down, even in some engines to the one rocker that's knocking because the gap has opened up.

Anyway, after all that are you saying YES, it was a bent pushrod all along?

This begs the next question - if that is true, how did the pushrod get bent?
It's not the sort of thing that happens all by itself. Practically always it happens because (1) the pistone and valve collide (broken timing belt etc) or (2) the engine sucks in something hard, like a stone, or a nut or bolt, whatever.

There aren't all that many possibilities, so which one was it if a bent pushrod was the problem?

Take care, and examine all 8 pushrods by rolling them, and it's best to keep them in order so they go back where they came out.

If the pushrods are all straight, start thinking there's probably a broken camshaft follower in there. They can be changed in situ but take care, and I think you'll need to take the cylinder head off to get them out. You probably don't want to damage the CAMSHAFT by running the engine for a second longer with a damaged follower.

Once you have worked out if it is a broken cam follower, there's not much choice what to do.
 
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hi charles - im not sure its the bent pushrod causing it - but am very hopefull, i think the reason its bent is due to going through water and some of it being sucked in to engine, have been told by many sources that the rods bend if the engine takes on water.
My plan is to fit a new pushrod - it will either run perfect or bend it again if the followers naff.
I will then look further if need be & am prepared to remove the head next if this doesnt solve it
Thanks for that advice tho - didnt think of followers !
 
offroadmad said:
hi charles - im not sure its the bent pushrod causing it - but am very hopefull, i think the reason its bent is due to going through water and some of it being sucked in to engine, have been told by many sources that the rods bend if the engine takes on water.
My plan is to fit a new pushrod - it will either run perfect or bend it again if the followers naff.
I will then look further if need be & am prepared to remove the head next if this doesnt solve it
Thanks for that advice tho - didnt think of followers !
Click to expand...


The "ROD" that usually gets bent when you suck in water is a CON ROD, the connecting rod twixt piston and crankshaft. It depends just how the bend takes shape what then happens, but a bent con-rod is NEVER good!

It is POSSIBLE but highly unlikely that a PUSHROD takes a bend because of water. For that to happen without ALSO bending a con-rod seems unlikely.

The water is pulled in on an induction stroke, then just as the piston passes bottom dead centre the inlet valve closes, so both valves are now closed, and the piston sets off upwards on a compression stroke. If there is more than a couple of teaspoonsful of water in the cylinder, Bye-Bye straight conrod - or worse. As both valves are closed and seated at this time, there can be no excess force applied to a pushrod or rocker.

If you do find a bent pushrod be sure to let us know which one it is, and inlet or exhaust. But, be afraid of a mangled cam-follower . . .

Of course, it might still prove to be something we haven't thought of yet.
 
CharlesY said:
The "ROD" that usually gets bent when you suck in water is a CON ROD, the connecting rod twixt piston and crankshaft. It depends just how the bend takes shape what then happens, but a bent con-rod is NEVER good!

It is POSSIBLE but highly unlikely that a PUSHROD takes a bend because of water. For that to happen without ALSO bending a con-rod seems unlikely.

The water is pulled in on an induction stroke, then just as the piston passes bottom dead centre the inlet valve closes, so both valves are now closed, and the piston sets off upwards on a compression stroke. If there is more than a couple of teaspoonsful of water in the cylinder, Bye-Bye straight conrod - or worse. As both valves are closed and seated at this time, there can be no excess force applied to a pushrod or rocker.

If you do find a bent pushrod be sure to let us know which one it is, and inlet or exhaust. But, be afraid of a mangled cam-follower . . .

Of course, it might still prove to be something we haven't thought of yet.
Click to expand...


I've repaired an hydralocked 200 that had a bent pushrod Con-rod was fine. no 1 exhaust.
 
redhand said:
I've repaired an hydralocked 200 that had a bent pushrod Con-rod was fine. no 1 exhaust.
Click to expand...


Hi Redhand,

It almost defies logic, but I too have heard of a few engines doing that after drinking water.

All the same, it's making a Hell of a horrible noise.

Fingers crossed for the easy final solution.
 
CharlesY said:
Hi Redhand,

It almost defies logic, but I too have heard of a few engines doing that after drinking water.

All the same, it's making a Hell of a horrible noise.

Fingers crossed for the easy final solution.
Click to expand...


I suppose water pressure keeps the valves shut and pushrod bends under stress of trying to push follower up.
 
redhand said:
I suppose water pressure keeps the valves shut and pushrod bends under stress of trying to push follower up.
Click to expand...



Yes, but the exhaust valves opens only as the piston is on the way DOWN and nearly at bottom dead centre, by which time the cylinder with the water in it MUST have gone over compression and tried to fire.

I really REALLY want to know what is making that horrible noise!

I think it sounds like a "half-engine-speed" noise which still points us at a cam and valves related issue.
 
jai_landrover said:
LRJack did a conrod at the landrover show last year
Click to expand...


Yes, he has stayed here a couple of times on his travels, and told me that.

The fact these engines can mangle and buckle conrods and pushrods, and be fixed good as new in no time is a testament to their excellent tough design.

Ask LRJack about his brake pipe on a recent trip from here to his home town.
 
jai_landrover said:
Hehe I phoned him after he posted about clamping it off to get to the garage.
Click to expand...

When he first stopped over here the sheep cleared off. I thought it was because they were scared of his dog. He told me he didn't have the dog last time he said he was coming to stop over, and I was looking forward to seeing if the sheep ran away when he arrived. I might have been wrongly blaming the dog for the sheep being a bit worried for their innocence . . .

But he didn't stop that time!
 
offroadmad said:
the bent pushrod was exhaust cylinder 1, all the rest are straight.
Click to expand...

WOW.

Ten past three in the morning of the second of January and he's pulling pushrods out of his engine! How keen is that? Amazing. Get a job up here anytime!

So Mr OffRoadMad, let's get this sorted ~ are you telling us that the engine is FIXED, no more bad noises, and it was that one bent Pushrod which caused that trouble all along?

You've done a lot of extra work in the meantime, but that's all an investment for the engine's future.

Let us know what happened please. Then I am going to try to work out HOW a bit of water can do that.
 
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