As previously stated the external leaks are not being caused by a need to have the Injectors rebuilt but most likely the Fuel Retur Hoses are shot.

Knowing the mileage on the Engine might be handy to determine if your Injectors are worn out or not.

Then there has been a couple of bad Diesel Fuel Threads that could have something to do with the nailing if it is not the Injectors.

If your Fuel Injection Pump timing is late enough it can nail.

Tale a look at the top of the Fuel Injection Pump. If it is wet the Delivery Valve Seals could need changing. Some have said the leaking Delivery Valve Seals can cause nailing.

Any Fuel Injection Shop should be able to do the Job. I would get out the Telephone Book and take a look at what Shops are in your area. Call on the Phone and ask what they Charge.

Someone else will have to give advice on which Injector Nozzles would be best for your Year and Model. It could be cheaper to purchase the Injector Nozzles seperate instead of having a local shop supply them.

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84 300D, 82 Volvo 244Gl Diesel