Urgent help with crazy problem!!

[preacherman]

I have been pulling my hair out trying to find a random, weird slight overheating issue. I have replaced the entire cooling system, everything, even hose clamps, did a head gasket job with shaved heads, and still have had a random, hard to reproduce slight overheating issue that follows no rules or pattern.

Out of frustration I pulled my water pump to replace it, just in case I got a bad pump and low and behold found this wedged in the blades of the pump???

It's hard plastic, not broken, and I cannot figure out what it could be??? I don't know the history of the truck so someone else may have dropped it in accidentally while working on the truck, but I want to make sure I don't have some bigger issue.

So any ideas what in the world this could be???


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[crystalclear]

just a maybe - is it a piece from the underside of the expansion tank cap?

 

[ColoDisco]

Does not ring any bells for me. Looks like it is a grommet that obviously was chewed by the pump. No markings?

 

[preacherman]

No markings. My wife thought it might be rubber that has hardened.


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[Bigplum]

It looks like the little grommet that the bonnet/ hood stay fits into

 

[preacherman]

It looks like the little grommet that the bonnet/ hood stay fits into

It does look like that. I wonder how in the world it ended up in the cooling system?


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[mpinco]

Consider this a guess. I have a 98 Discovery as a reference point. Some time in the past I had a radiator shop uncap, rod and solder the radiator. D1 radiators are metal. Later it had a slow leak and the old school radiator shop guy was surprised that they had used rubber seals on the tranny cooler connections. He disassembled, removed the rubber gasket, soldered in place of gasket/o-ring and no issues. If a previous shop had serviced the radiator and not payed attention those seals could be left in the cooling system to be later found by the next tear down.

I could also be completely in left field other than the shop I use had been around forever and he is really good.

 

[ColoDisco]

Those seals are much smaller. That is a grommet. I am guessing a clumsy mechanic dropped it at some point.

 

[Nonimouse]

Looks like a radiator support

 

[Factoid]

Might have been an ill advised attempt at a flow restrictor that broke loose and ended up in the impeller.

 

[jymmiejamz]

If this is a D1/RRC/D90, it is probably the radiator fill plug. They are prone to breaking and pieces can end up in the cooling system.

 

[Victory_Overland]

Looks like either the hood/bonet grommet or the radiator support grommet. When I took my radiator out of D3 mine tore and looked just like that.