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Porous Blocks

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Harry

07-31-2001 15:22:01

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Why exactly do Ford engines go porous? and is there any way of telling if an engine is about to go or how it can be prevented? Are there any models which were free of the problem? thanks.

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Nathan(GA)

08-02-2001 20:03:27

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Re: Porous Blocks in reply to Harry, 07-31-2001 15:22:01

I have an old 4500 hoe with the 3 cyl. diesel. It has a defect in the block casting on the outside. It's a hole about 3/8ths dia. with rough edges. Looks like some debris was in the thing when it was cast.

Now I'm having a problem with coolant blowing out. It could be a head gasket, but with my luck, it'll be a cylinder. Wonder if it has a defect.

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Brian

08-01-2001 08:47:35

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Re: Porous Blocks in reply to Harry, 07-31-2001 15:22:01

Porous blocks were a major problem on all Ford 000'nd series from the late 1970's through to the late 1980's. Ford never recognised the problem although one Ford farm near me had 8 failed blocks in the workshop in one year. These people changed to John Deere shortly afterwards. The water filters and special coolant solved the problem but not soon enough for a number of Ford customers. The block quality was also suspect as oil leaked through to the outside on some blocks and hard patches were found in the cylinder bores when re-boreing. Strangely enough, if Ford had sourced the block in South America (so the rumour here goes)no problems were ever experienced.

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paul

08-01-2001 09:34:23

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Re: Re: Porous Blocks in reply to Brian, 08-01-2001 08:47:35

This is diesel engine problem, NOT your gas engines, so don't panic folks! :)

The way a diesel ignites causes some vibrations through the block. Do to the suspected bad metal and not enough bracing, those years of Ford diesel engines would vibrate in a way that caused metal to cavitate off & cause pinholes, letting oil & water comingle. Since the engines don't have sleeves, repairs are a little more spendy. Using good antifreeze & the Ford additive goes a long way to preventing this, properly conditioned coolant does not support the cavitation. It is mostly the bigger engines, TW series & such.

--->Paul

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dave2_85

08-05-2001 13:03:58

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Re: Re: Re: Porous Blocks in reply to paul, 08-01-2001 09:34:23

Sounds like cavitation erosion. Diesel combustion shocks vibrating the cylinder causing bubbles in the coolant to form and explode against the cylinder, blasting away a little metal each time until eventually it pits thru. The Ford tractor engines aren't the only ones it happens to. It happens to the Ford (nee International) pickup diesel engines from 1980's on, too. At my old work, we went thru four blocks in an '88 Ford IDI diesel. Internationals were famous for this, especially the wet sleeve truck and tractor engines DT466, DT360. I have a wet sleeve from a Dt360 with a lot of pinholes. You have to watch the coolant very carefully, use additive, filters, etc.

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TomG

08-01-2001 02:20:18

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Re: Porous Blocks in reply to Harry, 07-31-2001 15:22:01

I wonder if the question is about coolant cavitation. As far as I know, the problem exists mostly in larger diesel engines, and some engines are especially prone. I guess extreme damage could result in something called a porous block. I believe the solution is to use a diesel rated anti-freeze and change it regularly. I believe there also are anti-cavitation additives and test kits available.

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Jim K

07-31-2001 19:27:38

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Re: Porous Blocks in reply to Harry, 07-31-2001 15:22:01

Harry are you talking about the ford navistar diesel truck engines that get pinholes in the cylinders due to heat and vibration. I haven't heard of it happening to the ford tractors.
Jim K

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rasputen

07-31-2001 19:10:22

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Re: Porous Blocks in reply to Harry, 07-31-2001 15:22:01

At the risk of biting a trebble hook,

What is a porous block? Does the oil and water leak out through the castiron? Did I miss something along the way?
bd

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07-31-2001 18:31:00

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Re: Porous Blocks in reply to Harry, 07-31-2001 15:22:01

Harry I sure hope somebody has some input for ya cause I'm not aware there is any such history? Where did you hear this? Could it be one lemon in the sea? Does this happen with other brands as well? May be Tony Jacobs will jump in at some point and set the record straight as he has had is hands on a bunch of em. Any body else..... .

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JHunt

08-02-2001 00:06:27

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Re: Re: Porous Blocks in reply to AB, 07-31-2001 18:31:00

Just some further comments on cavitation. What causes it is when the cylinder wall flexes inward suddenly as the pressure inside the cylinder decreases after ignition, there is a low pressure area created on the outer surface of the cylinder wall. The coolant turns to gas in this low pressure and collapses on the cylinder's outer surface as it turns back to liquid and erodes the metal slightly in the process. It is not limited to just certain engines but becomes more of a problem as compression is raised and/or cylinder wall thickness is decreased. The additive or DCA should be part of the maintenance of most if not all diesel engines. What it does is coat the outsides of the cylinders and it is eroded instead of the metal in the process above. If you have ever seen it firsthand, it is hard to believe it happens the way it does. The mechanic at the local Cummins shop showed me a liner from a N series engine that looked like someone drilled a 3/16" hole right through the side of it.

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joel

08-01-2001 23:56:49

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Re: Re: Porous Blocks in reply to AB, 07-31-2001 18:31:00

We have an 8000 that got a pin hole in the number 5 cyl and started leaking water, had the head off twice before I found it.I have talked to several other people that have had this problem they also hade it on the number 5 cyl.8000 thru the TW series are the only ones I have heard of that have had this problem

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