BMW M30 Starter Bolt Field Report
BMW Built the Sweetest Six in Europe. Then They Buried the Top Starter Bolt Where No Wrench Will Turn.
June 2026 · 8 min read
Sixteen years with this car. I do my own work, because the last good BMW man around here is closer to retiring than I am.
There is a job on these old big six BMWs that the manual calls an hour, and that has cost more good Saturdays than any other. It is getting the top bolt off the starter. The bolt costs nothing. The reason men give up is not the bolt. It is that you can see it, you can lay two fingers on it, and you cannot get a wrench or a socket square on it long enough to turn it.
I am not a mechanic and I am not selling anything. I am a retired airline captain who flew for Delta for thirty years, and for the last sixteen I have kept a 1987 535is in my garage outside Atlanta. I do my own service work, partly because I like it, and mostly because the good independent BMW men around here are retiring one by one. The few who are left run about a hundred and eighty five an hour and book you out for weeks.
I am writing this for every owner who has leaned over that engine, looked down past the intake at a starter bolt he could touch and could not turn, and felt the quiet anger of a capable man beaten by half an inch of room. Because a retired BMW tech named Sal put the answer in my hand at a meet, and told me to pass it on.
The part of the brochure they never wrote
Everyone tells you the same two things about the M30 big six. That it is smooth and strong, which is true. And that these are simple cars to work on, which is mostly true, right up until you hit the one spot that is not. The starter sits low on the side of the block, tucked behind the intake, and BMW packed the bay in so tight around it that the bottom bolt is the only one that comes out like the book says.
The bottom bolt drops right out. That is the cruel part, because it convinces you the job is on. Then you get to the top bolt. It sits up against the Bosch starter housing with the intake crowding it from above, and there is no room to swing anything square on it. Men on the owners' forums keep a wrench they ground down and bent on a grinder just for this one bolt. Some swap stories about half moon wrenches and obstruction wrenches and thin wall sockets, every one of them a different way to cheat a few degrees out of a spot BMW left no room in.
Everything in my toolbox had a go. Here is how each one did.
- Standard socket and ratchet. The socket would not even seat square, the housing and the bay were too close. The ratchet had nowhere to swing.
- Box-end wrench. Fouled on the starter housing before the bolt so much as moved.
- The open end of the wrench. Four degrees, then it walked off the corner and I busted a knuckle on the block.
- The flat toolkit wrench from the trunk, and a 17mm I ground down and bent years ago. A few more degrees each, and only ever a few degrees at a time.
- The specialist. A hundred eighty five an hour, booked out for weeks, and most of them will not take a car this old anyway.
What the access actually costs a man
Put the real cost on the table, the honest way. The bolt is not seized. A specialist would not need penetrant or heat or a single new part. He would charge you for access, and nothing else. The independent BMW men who still know these engines run about a hundred and eighty five an hour, their waiting lists run to weeks, and the dealer is higher than that, when they will take a forty year old car at all, which most of them will not.
So the belief settles in, the one you hear at every cars and coffee. You only keep an old BMW if you can pay another man to reach the parts you cannot. I nearly swallowed that myself, sat on the creeper near dark with a raw knuckle, looking at one 17mm bolt I could touch and could not turn, weighing what the car was costing me against what it is worth now. My wife came out, looked at the car, looked at me, and just left a glass of tea on the bench. After all these years she knows when to say nothing.
You can get two fingers on it. You cannot get a tool square on it. That half inch is the whole story.
Then an old BMW tech put a bar in my hand
Sal is seventy one. He ran an independent BMW shop for thirty four years, the old kind, the kind that closed when the cars all went to laptops, and now he turns up at the meets with a clean E9 coupe and a folding chair. I met him at a BMW club drive, told him about the top starter bolt, the four degrees, the busted knuckle. He did not laugh. He just nodded the way a man nods at a problem he made peace with a long time ago. He went to a drawer in his truck, past his own bent 17mm and a half moon wrench worn smooth, and handed me something else.
It looked like a flat steel bar, a square drive at each end, with a slight offset built into it. He had me press the drive end with my thumb. Something gave, very slightly, inside the steel. A roller chain, sealed the length of the bar. "The chain carries the offset for you, so you keep square torque the whole way," he said. "You come in flat from the side, where the room is, and the turn lands dead square at the far end where your hand fits. It does not fold like a wobble, there is no hinge in it. It does not walk off the flats like a crowfoot can. I have wanted one of these my whole career. Somebody finally built it right. Buy the real one and leave the copies alone."
"The chain carries the offset for you."
A slim, dead straight bar, about half an inch thick, that slides flat into the gap by the starter where nothing else fits. The sealed roller chain inside carries your pull round the offset and lands it square on the nut, with a ratchet out in clear air where your hand has room. It is called the Savary offset wrench.
The sealed chain is the trick
A roller chain inside the steel body carries torque round the offset, so it never folds like a flex-head or walks like a universal joint.
It moves the ratchet out of the hole
A slim half inch thick bar slips flat into the gap by the starter, and your ratchet swings in open air instead of fouling on the housing.
Takes your own sockets
Square drive at both ends fits the sockets already in your box. Holds real torque, up to seventy newton meters, a hair past fifty foot pounds.
It reaches. It is honest.
This solves access to a bolt that will turn but you cannot get a tool on. It is the right shape for a tight bay, not a miracle for a stud already rusted to nothing.
It only comes from one place
You will not find it at the parts store and you will not find it at the swap meet. The maker sells direct from their own site only. Eighty nine dollars, shipped to your door. That is half of one hour of any specialist who will still take the car, for the one tool that turns the bolt everybody dreads into a quiet Saturday morning with the radio on.
What happened next
Other owners who stopped paying for access
"Did the starter in my own driveway without pulling the intake. That top bolt has beaten me twice over the years and sent me to a shop once. Came off square on the second pull with this thing."
"I have a drawer full of ground-down wrenches for that shark's tight spots. This bar replaced all of them. Came at the bolt flat from the side and my hand never had to fit where it does not."
"Bought a cheap chain bar off Amazon first. It folded on the first real pull, just like the article warned. The real one from the maker does not give at all. Night and day."
Sal, thirty four years a BMW man. He is the one who put the real bar in my hand and told me to pass it on.
Get yours before the driving season runs out
If you keep an old big six BMW running, a 535, a 635, a shark, and you have ever sat there staring at a bolt you could touch and could not turn, you already know exactly what this is worth. And if you have been telling yourself you are getting too old for that engine bay, it was never your hands. It was the room BMW left you.
Bavarian Iron Field Notes is a reader-supported publication. This is a first-person account from a private owner and reflects his personal experience. The Savary offset extension wrench is a hand tool designed to reach fasteners in tight, blind locations. It improves access; it is not represented as a remedy for fasteners that are corroded or seized beyond normal service. Always follow proper service procedures and torque specifications. Results vary by vehicle and condition. This publication is not affiliated with BMW AG.
