D24TIC - Cam belt tensioner setting

jpliddy · Dec 30th, 2008, 23:27

hello all. we woud like to know if the tennsion of the cam belt needs to be set with the volvo tool ref. no 5197 . my freind and myself drive 940 tdi year 1995 which you will know has the spring loaded belt tensioner. my freind has just replaced his belt and all other sevice parts. but we are concerned how exact the belt tension has to be. your coments are most welcome as this is a very critical part of the engine

jor · Dec 31st, 2008, 01:51

Perhaps someone will correct me if I am wrong, but I don't think that there is an adjustment for tension on this belt. The belt (119 teeth IIRC) is fitted while the tensioner is pushed out of the way. Without doing this it is not possible to get the new belt on properly. Then when the tensioner is released it adds whatever tension there is in the spring.
The tool will tell you if the tension is correct, but if adjustment is not possible won't be of much benefit.

jor

migrator · Dec 31st, 2008, 09:46

Quote:

Originally Posted by jpliddy

hello all. we woud like to know if the tennsion of the cam belt needs to be set with the volvo tool ref. no 5197 . my freind and myself drive 940 tdi year 1995 which you will know has the spring loaded belt tensioner. my freind has just replaced his belt and all other sevice parts. but we are concerned how exact the belt tension has to be. your coments are most welcome as this is a very critical part of the engine

The following is from the D24TIC Green Book (for the 760 series but the same engine).

Set Belt Tension
Adjust tension by removing cooling pump.
Use guage 5197 to check tension.
Attach guage to belt and set to 12.5 units.
Stretch belt until mark on guage plunger is flush with sleeves. Tighten retaining bolts.
Depress belt with strong hand pressure and recheck/adjust tension.

The above is from the section on Camshaft Installing. I do not know if any other items/equipment need to be removed to access the belt. This is not something I have ever done on the car - it is a quote from the manual that you may find of interest.

This Green Book is reference TP 3057 1/2 and is available from dealers (despite what they might say) for about £30.00.

jpliddy · Dec 31st, 2008, 10:12

hello jor
both our cars have 120 teeth when the belt tensioner is located with the spring there is very little tension there is a allen key hole next to the nut which secures the tensioner so we are thinking it must be set to a gauge but in the past we have both guest the tension my car has done 55000 miles on this belt i ajusted it when i had it put on because it seemed to slack . it will be changed in the new year . my freind had a look at it and thinks it is a little bit slack so i may have to ajust it a tiny bit but do you think we shoud obtain the special gauge
regards james liddy

jpliddy · Dec 31st, 2008, 10:23

hi migattor
we both have the green book . i think the 760 has no spring loaded belt tensioner as the ajustment is done via the water pump . engines after 1993 where fitted with the spring loaded belt tensioner. i am thinking now the belt needs to be set via the special gauge we will try to locate one when mine is ready to change . my freind has had a belt snap . and also a water pump fail .so im changing the water pump next time .so i i have seen the damage that these failures cause.
regards
james liddy

jor · Dec 31st, 2008, 17:08

James, I wonder if you have the correct belt. The belt removed from a 93 SE TD (Volvo belt) has 119 teeth (x 1"). There is a 120 tooth belt but I cannoy remember what it was for ? 850 tdi. Maybe that's why you find a little loose? In which case the usual maxim that 'a loose belt is a happy belt' may not be applicable. You certainly wouldn't want it to slip another tooth.
The nut for the tensioner just holds it in place and does not adjust the tension, which as you say derives from the spring loading. Tool 5197 may assist with the other belts which are adjustable.

jor

jpliddy · Dec 31st, 2008, 22:02

well jor
the belt and other parts came from the main dealer. i take it the 1993 car had a belt tensioner as before this year as shown in the green book they show no tensioner. the parts i purchased via my number plate reference so hope they got it right . im fairly sure the previous belt which also came from the same main dealer had 120 teeth. but did not save the belt. i will try to confirm this.im sure the belt my freind has just put on his 940 tdi 1995 has 120 teeth. i will confirm this and let you know .
thanks .james liddy

jor · Jan 1st, 2009, 04:15

Certainly will be interested to see what they say. See auction site item 350146188909 in the meantime.

jor

jpliddy · Jan 1st, 2009, 17:59

hello jor
i have seen the item you mentioned . that may confirm we have the right belts .ie. 120 teeth . cars fitted with belt tensioner are after 1993 before that the water pump did the tensioning . i am thinking all models
have to be set up with the special tool gauge to correct tension. what do you think.
regards
james liddy

jor · Jan 2nd, 2009, 17:57

No, that ad mentions a belt 119 x 1". One tooth is not going to make a lot of difference, but it is going to make the belt some fraction of a centimetre longer. Easier to put on of course and I do not know to what degree the tension would be affected, but definitely worth checking on.

From www.preferredcomponents.com

j2386cc D24, T Diesel 6 cyl 1981-86 240, 260, 740, 760 Incl. Turbo Diesel Timing Belt B83front - 119 teeth

jor

Dec 30th, 2008, 23:27	#1
jpliddy VOC Member Last Online: May 3rd, 2024 14:15 Join Date: Dec 2006 Location: stoke on trent	Cam belt tensioner setting hello all. we woud like to know if the tennsion of the cam belt needs to be set with the volvo tool ref. no 5197 . my freind and myself drive 940 tdi year 1995 which you will know has the spring loaded belt tensioner. my freind has just replaced his belt and all other sevice parts. but we are concerned how exact the belt tension has to be. your coments are most welcome as this is a very critical part of the engine

Dec 31st, 2008, 10:12	#4
jpliddy VOC Member Last Online: May 3rd, 2024 14:15 Join Date: Dec 2006 Location: stoke on trent	jpliddy hello jor both our cars have 120 teeth when the belt tensioner is located with the spring there is very little tension there is a allen key hole next to the nut which secures the tensioner so we are thinking it must be set to a gauge but in the past we have both guest the tension my car has done 55000 miles on this belt i ajusted it when i had it put on because it seemed to slack . it will be changed in the new year . my freind had a look at it and thinks it is a little bit slack so i may have to ajust it a tiny bit but do you think we shoud obtain the special gauge regards james liddy

Dec 31st, 2008, 10:23	#5
jpliddy VOC Member Last Online: May 3rd, 2024 14:15 Join Date: Dec 2006 Location: stoke on trent	jp liddy hi migattor we both have the green book . i think the 760 has no spring loaded belt tensioner as the ajustment is done via the water pump . engines after 1993 where fitted with the spring loaded belt tensioner. i am thinking now the belt needs to be set via the special gauge we will try to locate one when mine is ready to change . my freind has had a belt snap . and also a water pump fail .so im changing the water pump next time .so i i have seen the damage that these failures cause. regards james liddy

Dec 31st, 2008, 17:08	#6
jor VOC 20573 Last Online: Jul 10th, 2023 22:14 Join Date: Mar 2007 Location: wembley	James, I wonder if you have the correct belt. The belt removed from a 93 SE TD (Volvo belt) has 119 teeth (x 1"). There is a 120 tooth belt but I cannoy remember what it was for ? 850 tdi. Maybe that's why you find a little loose? In which case the usual maxim that 'a loose belt is a happy belt' may not be applicable. You certainly wouldn't want it to slip another tooth. The nut for the tensioner just holds it in place and does not adjust the tension, which as you say derives from the spring loading. Tool 5197 may assist with the other belts which are adjustable. jor Last edited by jor; Dec 31st, 2008 at 17:32.

Jan 2nd, 2009, 17:57	#10
jor VOC 20573 Last Online: Jul 10th, 2023 22:14 Join Date: Mar 2007 Location: wembley	No, that ad mentions a belt 119 x 1". One tooth is not going to make a lot of difference, but it is going to make the belt some fraction of a centimetre longer. Easier to put on of course and I do not know to what degree the tension would be affected, but definitely worth checking on. From www.preferredcomponents.com j2386cc D24, T Diesel 6 cyl 1981-86 240, 260, 740, 760 Incl. Turbo Diesel Timing Belt B83front - 119 teeth jor Last edited by jor; Jan 2nd, 2009 at 18:06.

Dec 31st, 2008, 01:51	#2
jor VOC 20573 Last Online: Jul 10th, 2023 22:14 Join Date: Mar 2007 Location: wembley	Perhaps someone will correct me if I am wrong, but I don't think that there is an adjustment for tension on this belt. The belt (119 teeth IIRC) is fitted while the tensioner is pushed out of the way. Without doing this it is not possible to get the new belt on properly. Then when the tensioner is released it adds whatever tension there is in the spring. The tool will tell you if the tension is correct, but if adjustment is not possible won't be of much benefit. jor

Dec 31st, 2008, 22:02	#7
jpliddy VOC Member Last Online: May 3rd, 2024 14:15 Join Date: Dec 2006 Location: stoke on trent	well jor the belt and other parts came from the main dealer. i take it the 1993 car had a belt tensioner as before this year as shown in the green book they show no tensioner. the parts i purchased via my number plate reference so hope they got it right . im fairly sure the previous belt which also came from the same main dealer had 120 teeth. but did not save the belt. i will try to confirm this.im sure the belt my freind has just put on his 940 tdi 1995 has 120 teeth. i will confirm this and let you know . thanks .james liddy

Jan 1st, 2009, 04:15	#8
jor VOC 20573 Last Online: Jul 10th, 2023 22:14 Join Date: Mar 2007 Location: wembley	Certainly will be interested to see what they say. See auction site item 350146188909 in the meantime. jor

Jan 1st, 2009, 17:59	#9
jpliddy VOC Member Last Online: May 3rd, 2024 14:15 Join Date: Dec 2006 Location: stoke on trent	hello jor i have seen the item you mentioned . that may confirm we have the right belts .ie. 120 teeth . cars fitted with belt tensioner are after 1993 before that the water pump did the tensioning . i am thinking all models have to be set up with the special tool gauge to correct tension. what do you think. regards james liddy

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