642B 4G32 timing belt

[GOM]

I'm curious if anyone knows if the Mitsubishi 4G32 in my 643B Bobcat is a freewheeling or an interference engine. There is no timing belt replacement interval in the manual, and the engine is evidently a lower compression, much less powerful version of the car/truck engine. I'd like to think that they shortened the connecting rods for lower compression or cut clearance pockets in the pistons to clear the valves if the timing belt breaks, but I can't find conclusive evidence anywhere. Has anyone ever had a timing belt jump or break? Did the valves collide with the pistons and bend, or did replacing the belt put the engine back into operation? My belt looks good now, but the plastic cover is getting brittle and I worry that bad things may happen if debris or water/ice gets in there and derails the belt. Thanks in advance for the help!

 

[flyerdan]

Internet says that this is a 1.6L 8 valve SOHC, so according to this list , it is an interference engine.

 

[Djamsa]

I just had mine break and I don't think it hurt the valves or piston. I was told it is an non interference engine. I am looking for a tensioner since bobcat parts told me it was $578 thru them.

 

[Dave1234]

I just had mine break and I don't think it hurt the valves or piston. I was told it is an non interference engine. I am looking for a tensioner since bobcat parts told me it was $578 thru them.

Did you find a tensioner somewhere else? details? I would expect one for an automotive (dodge colt, etc) application should have worked, but would be nice to hear details of what you found.

 

[Geo Man]

@Dave1234 Zeek the Antique freak gives some good info on timing belt here is a nice little video.

MD008965 : TENSIONER FOR MITSUBISHI & CATERPILLAR - Same Day Shipping - Lift Parts Warehouse

Shop MD008965 : TENSIONER FOR MITSUBISHI & CATERPILLAR online with same day shipping. Lift Parts Warehouse is an online marketplace for buying high-quality forklift parts.

www.liftpartswarehouse.com

I did some hunting

I know reaching out to NZ is a stretch but here another:

TENSIONER - MITSUBISHI 4G32-4G37 | Butler Auto Mart

TENSIONER - MITSUBISHI 4G32-4G37, TENSIONERJPU60-260+JF397, MD109958, QTT386, MD109958, MD167680, MD109958, VKM75108,, Price: $29.51

www.butlerautomart.co.nz

I have found the following, to help in your search. If it works out / or not and if there is something out there for our old machines then great.

I hope this helps

Cheers

Geo.

 

[dfb]

Did you find a tensioner somewhere else? details? I would expect one for an automotive (dodge colt, etc) application should have worked, but would be nice to hear details of what you found.

I replaced my timing belt tensioner with the belt as maintenance before it was a "broken" problem, the bearing was loud. I did not go the Bobcat route for the new one and recall getting the automotive one only to find the bracket was a bit different. I gave both of them to a welder buddy of mine and he grafted the old bracket section necessary to make the new automotive tensioner work. At the end of it all I had a nice new tensioner at a fraction of the Bobcat cost.

 

[Geo Man]

Nice path taken @dfb awesome that you are all good. I was wondering if anyone else have found a matching part for those who aren't gifted welders or have friend who are?

 

[Jim A]

On Deutz diesel if belt fails valves bend .
Don't ask me how I know this.