Perkins Coolant leak

[John from Skibb]

Hi all,
Has anyone ever seen coolant leak on the timing cover between the injector pump and the block of a perkins 4cyl in a clark forklift. So it on the opposite side of the timing cover to the water pump itself. It dosent look like it's coming from a gasket but rather a hairline crack in the cover maybe?

The leak is under the 2 pin connection I'm the middle or the picture. Thanks in advance for any suggestions

 

[ACEngineering]

Hi all,
Has anyone ever seen coolant leak on the timing cover between the injector pump and the block of a perkins 4cyl in a clark forklift. So it on the opposite side of the timing cover to the water pump itself. It dosent look like it's coming from a gasket but rather a hairline crack in the cover maybe?

The leak is under the 2 pin connection I'm the middle or the picture. Thanks in advance for any suggestions

Common as muck on them 1000 series perkins. It will be the gaskets, but the timing cases do like to corrode and dump the water on the timing gears so you will probably need to just fit a new cover anyway.

Ideally need sump removed too as timing case bolts to it but you can do it with sump on if you have to, just have to be careful how you do it or it'll leak oil after were block/timing case and sump meet.

 

[ACEngineering]

Plastic thermostat connection and housing are also common to leak.

 

[John from Skibb]

I might start my removing that plastic housing and the aluminum under it in case it is percolating from there and appearing lower down

 

[ACEngineering]

I might start my removing that plastic housing and the aluminum under it in case it is percolating from there and appearing lower down

You can but if doing the timing cover with the sump on you WILL have to remove that thermostat housing again.

 

[BredRedHfd]

Plastic thermostat connection and housing are also common to leak.

Had four, and had to 'do' every one

 

[John from Skibb]

You can but if doing the timing cover with the sump on you WILL have to remove that thermostat housing again.

Ok, althought I think since it is much less work I will try it and at least rule it out. It will only cost me a gasket

 

[John from Skibb]

Had four, and had to 'do' every one

Plastic seems like an awful design. This one is not a problem. It's pretty clear there is no leaks around it.

 

[ACEngineering]

Plastic seems like an awful design. This one is not a problem. It's pretty clear there is no leaks around it.

Plastic isn't the problem, its the corrosion that builds up between the plastic and the aluminum or steel that the issue.

Yours has an aluminium housing but most had plastic tops and bottom housings.

I clean the housings 100% of all rust etc then coat them with a loctite gasket dressing which is a bit like brown tar! let it dry then assemble with either a gasket or the orings depending which type i'm doing.

 

[kevindb880]

Had a leak in the very same place on our loadall, changed the thermostat seal and the gasket where the thermostat housing fits to the head, did it today so hopefully tomorrow it will be dry.

 

[will_mck]

I've a 1000 series Perkins engine leaking water into the sump lately. Changed the oil cooler thinking it was leaking but this didn't solve the problem. Have been told it could be either a gasket gone on the timing case cover or the water pump is gone. How would you know whether the problem is the timing cover gasket or the water pump?

 

[ACEngineering]

I've a 1000 series Perkins engine leaking water into the sump lately. Changed the oil cooler thinking it was leaking but this didn't solve the problem. Have been told it could be either a gasket gone on the timing case cover or the water pump is gone. How would you know whether the problem is the timing cover gasket or the water pump?

it could be the water pump if the external leak holes are blocked but that not common only got caught out like that once.
almost every time its the timing case corroded through dumping the water on the timing gears.
Never had the oil coolers leak myself.

 

[will_mck]

it could be the water pump if the external leak holes are blocked but that not common only got caught out like that once.
almost every time its the timing case corroded through dumping the water on the timing gears.
Never had the oil coolers leak myself.

Thanks does this mean I need a new timing case or just the gasket? There's no leak externally, it's just making its way down into the sump some how. 8200hrs on the engine and this is the first trouble I've had, it's a JCB 530-70. The water pump hasn't been changed yet.

Also in another engine you advised me to use that loctite gasket sealant on one those plastic thermostat housings and it's done the trick so far, it's really sticky stuff!

 

[ACEngineering]

Thanks does this mean I need a new timing case or just the gasket? There's no leak externally, it's just making its way down into the sump some how. 8200hrs on the engine and this is the first trouble I've had, it's a JCB 530-70. The water pump hasn't been changed yet.

Also in another engine you advised me to use that loctite gasket sealant on one those plastic thermostat housings and it's done the trick so far, it's really sticky stuff!

yes new timing case, not maga expensive, around £160 ish i expect plus bottom gasket set.

 

[Pistonbroke]

What prevents the corrosion,is it type and mix of coolant?

 

[ACEngineering]

Thanks does this mean I need a new timing case or just the gasket? There's no leak externally, it's just making its way down into the sump some how. 8200hrs on the engine and this is the first trouble I've had, it's a JCB 530-70. The water pump hasn't been changed yet.

Also in another engine you advised me to use that loctite gasket sealant on one those plastic thermostat housings and it's done the trick so far, it's really sticky stuff!

Here's one I did earlier

2nd pic is cover off the manitou.

 

[ACEngineering]

What prevents the corrosion,is it type and mix of coolant?

Yes good antifreeze will help, but its just something perkins will do over time anyway.

if you want to give a new engine the best chance then use good antifreeze and Distilled water, hardly anyone does though.

it was a bad design imo water does not circulate through that little pocket (later covers they notched a bit out to help it but IMO didnt help much as wasn't enough) if water circulated through it more then the build up of crap wouldn't corrode the cover through so easy.

 

[Pistonbroke]

Yes good antifreeze will help, but its just something perkins will do over time anyway.

if you want to give a new engine the best chance then use good antifreeze and Distilled water, hardly anyone does though.

Any particular antifreeze or just plenty of blue

 

[ACEngineering]

Any particular antifreeze or just plenty of blue

I use blue normally, mix it with distilled water to get the best results but IMO if the engine is already rusted inside then its not going to make much odd IMO.

for some engines i use the red organic stuff mixed with distilled BUT you need to be careful which customers you do this for cause you can not mix normal blue antifreeze with the long life organic stuff or it can react and set like jelly!

 

[ACEngineering]

Thanks does this mean I need a new timing case or just the gasket? There's no leak externally, it's just making its way down into the sump some how. 8200hrs on the engine and this is the first trouble I've had, it's a JCB 530-70. The water pump hasn't been changed yet.

Also in another engine you advised me to use that loctite gasket sealant on one those plastic thermostat housings and it's done the trick so far, it's really sticky stuff!

you can use that gasket sealant on the timing case gaskets too, again as i said in PM smear it on lightly (not too much or the gasket will squish out the joint as you tighten it!) let it dry takes longer than you think! then assemble it all, never leak again.

Getting it all clean is a pain in the arse, lots of brake cleaner, 8mm and 10mm tap required to clean the threads out and an airline.
also there is 1 bolt hole right on the corner by the injector pump where they always leak, to give the gasket more surface area to seal i chop the head off a bolt cut a light screw driver slot in it, small bit of loctite on it and thread it in, but not quite flush, then carefully grind it off flat with the Dremel so its flat to the block. Someone somewhere will curse me if engine ever goes for a service exchange for a different application where the bolt hole may actually be needed