Motor mount bolt MIA
 

Anyone know the size and thread of the 8mm center motor mount bolt? Mercedes 300d 1985

Get vin and take it to dealer and purchase the proper fastener. I can't imagine it being over about $5. Pretty sure you won't find the correct fastener at Home Depot.

Closest Mercedes dealer is about 2 hour drive from me is the only Thing lol

disom93, call a MB dealer and have them mail/ship the bolt to you, or go to a salvage yard ... which will entail a lot of work for a low cost item.

If you are talking about the small bolts that fit into the underside of the mount itself - through the cross member then I am pretty sure they are of 8.8 strength (minimum for these cars) and are of standard coarse metric thread what ever the size is.

If, however, you are talking about the bolts that hold the cross member to the chassis then I think they are 10.9 strength and could be a fine thread - I can't remember the specifications for sure.

Use my uncertain information with caution! Do not cross thread or try to use the wrong thread!

They have some hex bolts at Home Depot but not many. Probably none that size. You could take it to Home Depot to determine the length and thread size/pitch then order it online from Fastenal.

Bolts (If We're going UNKNOWN)
 

Metric

Try any Ace Hardware,they usually have a good selection!

I just didn't have the one to try it's missing not sure where it went so was needing an idea of what to order

And yes it's the one coming from bottom thru the center

10x1.50 or 10x 1.75

disom93, describe the location of the bolt to the MB Parts Department rep and he will check the parts diagram for your car to provide the proper bolt. If you have never gone to a MB Parts Department, with the VIN for a car they can look up any part for any MB vehicle. That eliminates any guess work, or wondering if you are going to get the correct part.

Ok I called dealer they can get the bolt but they didn't know the size I guess I'll pull the other side one out and just take it to the store with me to see thanks for the help

It's not a 5$ bolt sadly....

https://c1552172.ssl.cf0.rackcdn.com/588965_x800.jpg

Pelican Parts - Product Information: 123-990-02-12-MBZ

$20 for a bolt like that is one of the many, many reasons I have ceased even calling Pelican

My PnP posts that screws are a dime each. Sure better than the screwing pelican wants to give us.

They are but I can tell you from person experience, as I also lost one of these bolts, that it is near impossible to remove one with the weight of the engine on the mount and when pnp has the cars raised 3ft...how does one lift the engine? Another issue, if your like me....and the closets pnp is 150 miles one direction....a 20$ bolt is a lot cheaper then fuel, pnp entrance fee and taking a day off of work....

Here is a used one on ebay as well..

1985 Mercedes 300D Engine Mount Bolt | eBay